I just wanted to chime in on the "Meth" thing.
First off I wasn't aware that it occurred in nature but I'm sure the natural occurrence is rather different than most street peddled examples, though I am willing to accept the occasion of being wrong.
I feel the "evil" in this case is not the substance, but the proliferation of it by unscrupulous vendors.
This is the age old notion that the universe exists as a neutral energy. Only through our perceptions and actions is it tinted "good" or "evil". Selling a destructive and addictive chemical knowingly filled with toxic impurities for the sake of personal gain is quite obviously evil. The chemical doesn't really play a role in this situation.
That being said, this is not a "pick and eat" situation unless you are doing straight up aya.
However, the organic chemistry at work is fairly universal and this is not a specialized technique. The method works within the natural laws concerning all alkaloids.
In terms of natural vs synthetic this is (IMO) natural. It occurs in nature, you are not changing it's chemical structure...All we are doing is filtering it out.
It depends on how far you want to take it. The statement used in favor of MJ states : "God made marijauna, man made beer (or alcohol) - Which one do you trust?"
Obviously this statement implies that weed is more "natural" than alcohol....and while I agree, I still think the fermentation process which produces alcohol is a natural one.
I would view this process in similar terms.