Steve Beyer who has been using Ayahuasca with real shamans in the amazon for over 20 years has this to say:
"The dichotomy is also subverted among the Shuar. The tsentsak, magic darts, kept within the chest of a Shuar shaman, are living spirits, who can control the actions of a shaman who does not have sufficient self-control. The magic darts want to kill, and it requires hard work to keep them under control and use them for healing rather than attack. That is why it is considered to be much more difficult to be a healer than a sorcerer: it is difficult to resist the urges of the darts; as some Shuar say, “The tsentsak make you do bad things.” Thus, Shuar shamans are, in a real sense, possessed, but not by the soul of a deceased human person; they are possessed by their own shamanic power, with which they are in continuous interaction.
Aguaruna shamans, too, when they begin to heal, call pasuk to enter into their bodies. Pasuk are the spirits of formidable shamans who live in the forest, enter into the human shaman’s chest, and tell the shaman information about the sick person. While shamans are said to control their pasuk, the extent of this control appears to be variable. Similarly, the Parakanã of Eastern Amazonia believe that shamans possess pathogenic agents that cause sickness, called karowara. When animated by a shaman, karowara are tiny pointed objects; inside the victim’s body, they take the concrete form of monkey teeth, some species of beetle, stingray stings, and sharp-pointed bones. Karowara have no independent volition; but they have a compulsion to eat human flesh. Again, the relationship between shaman and pathogenic agent appears complex, and control is not easily defined."
And a bit more descriptive:
"Similarly, a significant part of the initiation process is for the new shaman to demonstrate the self-control which separates healers from sorcerers. Self-control is manifested in resisting the immediate urge to use newly acquired powers to cause harm. Among the Shuar, there is a general sentiment among the people that becoming a shaman — acquiring tsentsak, magic darts — creates an irresistible desire to do harm, that “the tsentsak make you do bad things.” Shuar shamans themselves dispute this. While the tsentsak indeed tempt one to harm, the desire can be resisted; those who “study with the aim to cure” become healers.
Shuar shaman Alejandro Tsakímp describes one of these temptations as the urge to try out the new darts on an animal — “a dog or a bird, anything that has blood.” Once one does that, once one “starts doing harm, killing animals, one cannot cure,” but becomes a maliciador, a sorcerer. Similarly, the Desana believe that sorcery is very dangerous, apt to rebound on its practitioner, and to be used only in narrowly defined circumstances — for revenge on a sorcerer who has killed a family member, for example. Thus it is the novice, the inexperienced, the untrained person who causes sickness — who lacks the self-control imposed by the shamanic initiation, who experiments with evil spells, who uses them carelessly and irresponsibly, just to see if they work.
This self-control is often expressed in terms of regurgitation and reingestion of shamanic power. Anong the Shuar, after a month of apprenticeship, a tsentsak comes out of the apprentice’s mouth. The apprentice must resist the temptation to use this dart to harm his enemies; in order to become a healing shaman, the apprentice must swallow what he himself has regurgitated. Among the Canelos Quichua, the master coughs up spirit helpers in the form of darts, which the apprentice swallows; here, too, the darts come out of the apprentice’s body and tempt him to use them against his enemies; again, the apprentice must avoid the temptation and reswallow the darts, for only in this way can he become a healer.
This self-control is sometimes also put in terms of turning down gifts from the spirits. The spirits of the plants may offer the apprentice great powers and gifts that can cause harm. If the apprentice is weak and accepts them, he will become a sorcerer. Such gifts might include phlegm which is red, or bones, or thorns, or razor blades. Only later will the spirits present the apprentice with other and greater gifts — the gifts of healing and of love magic.
Self-control is thus central. It is difficult to control lust and abstain from sorcery; even experienced shamans must work hard to maintain control over their powers, which are often conceptualized as having their own volitions.The pathogenic objects that are kept within the shaman’s body, often embedded in some phlegm- or saliva-like substance, are also in some sense autonomous, alive, spirits, sometimes with their own needs and desires, including a need for nourishment, often supplied by tobacco. If not fed properly, they can turn on their possessor, or seek their food elsewhere.
The magic darts kept within the chest of a Shuar shaman, for example, are living spirits, who can control the actions of a shaman who does not have sufficient self-control. The magic darts want to kill, and it requires hard work to keep them under control and use them for healing rather than attack. Similarly, the Parakanã of Eastern Amazonia believe that shamans possess pathogenic agents that cause sickness, called karowara. When animated by a shaman, karowara are tiny pointed objects; inside the victim’s body, they take the concrete form of monkey teeth, some species of beetle, stingray stings, and sharp-pointed bones. Karowara have no independent volition; but they have a compulsion to eat human flesh.
In this way, the pathogenic objects hidden within the shaman's body enact the Amazonian belief in innate human aggressiveness. To be a healer is to keep this powerful force in check by great effort."
Now Ayahuasca is just DMT with a MAO inhibitor so if you look closely at what this guy is saying even the love and light Shaman healers are possesed with bad shit, the just learn how to use there self control to fight the urge to kill things. And what about freebasing pure DMT then? Stuff that most Shamans don't even do. Do you really know what is happening or what you are inviting? Do you understand the spirit world, whats happening to you in these realms or how to navigate them in the slightest or what you come back with?
Some of you are still looking at this stuff from a 20th Century Freudian/Jungian angle or a purely scientific angle. "Oh it's ll in the mind, there is no evil or danger, good and evil don't exist, the spirits are just a part of you, you come back don't you?"
Why don't you take off the DMT rose tinted glasses and look at what experianced and knowledgable shamans have to say about it all.