@The Hermit:
What you said about science and fundamentalism was interesting. Obviously I agree with the part about science. Regarding fundamentalism, I would also agree that "a strict adherence to a basic set of beliefs or principles" is very harmful when those beliefs or principles are not in unity or harmony with reality itself, but actually makes a lot of sense if those principles are in unity or harmony with reality.
A Christian Fundamentalist, for example, holds a set of beliefs about the beginning and end of the world, the origin of life and species, and a whole bunch other ideas about reality, based upon the "fundamental principle" that the Bible is an infallible book containing nothing but absolute truth. Many of the supposed "truths" in the Bible have since been falsified through the progress of science, thus negating the idea that the Bible is infallible and contains nothing but absolute truth. As a result, those who still regard themselves as Christian Fundamentalist despite the scientific evidence, are often seen as "out of touch" with reality.
The same type of things can often be said about fundamentalists of any religion, where that religion is counter to that which is known about reality.
Now, let's imagine someone we'll call a "Mathematical Fundamentalist." This person believes that (at least some) mathematical principles represent absolute truth, of a sort. He or she believes that mathematical equations, for example, are capable of being definitively evaluated as representing true or false mathematical statements. (In other words: 1+1=2 would be regarded as true, while 1+1=3 would be regardee as false.) A "Mathematical Fundamentalist" would (or should) understand the limits of mathematics, and those areas of life where it is or is not applicable. For example, mathematics would be very applicable to determining how much change one is owed when paying for something at a store, but not applicable to determining what the lottery numbers will be tomorrow. (Otherwise there would be a lot of wealthy mathematicians out there! Mathematics would, however, be applicable to determining the odds of a particular set of numbers being drawn.)
Now, let's imagine something different...let's call it a "Reality Fundamentalist." This person believes that "reality exists" and that reality is EVERYTHING or ALL that exists. Furthermore, this person believes that the only way to know and understand reality is to study reality itself. (Well...that's actually a pretty good way of looking at science: it attempts to know and understand reality by studying reality itself.) It also turns out that the "Reality Fundamentalist" will eventually learn to co-opt the techniques of the "Mathematical Fundamentalist" into his or her "Reality Fundamentalism" because, as it turns out, reality operates in many ways which can be desribed mathematically. (Perhaps, upon realizing this, the "Reality Fundamentalist" draws the metaphysical conclusion that "Reality must be consistent with its own existence, or it could not exist," and understands that this is the reason that reality can often be described in mathematical ways.)
Now, there may well be limits to the knowledge which one can derive about reality...but the "Reality Fundamentalist" will not simply acknowledge that such limits may well exist, and then decide to cease all further investigation or exploration of the nature of reality. Instead, the "Reality Fundamentalist" will seek to know what these limits are, and will further seek to know and study all that can be known within these limits.
From the above, it would seem that "fundamentalism" in certain contexts leads to a divergence from and disharmony with reality, and that in other contxts, e.g., "Reality Fundamentalism," it can lead to the greatest possible unity and harmony with reality itself.
Because there are essentially infinite types of "fundamentalism" which can lead to divergence from and disharmony with reality, (Of which Christian and Muslim Fundamentalism are by far the most prominent on the world stage today) and actually only one which leads to the maximum unity and harmony with reality ("Reality Fundamentalism" ) the very term "fundamentalism" has taken on negative connotations.
I also think that most people innocently but incorrectly assume that there is no "one right way," of studying reality (and hence that ANY sort of fundamentalism would be wrong) because different people have different innate ways of relating to the world, by their very nature, and also because in life there are also many essentially equivalent ways of approaching and completing the same task. ("There is more than one way to skin a cat," is a reflection, albeit rather gruesome, of this.) Nonetheless, to know reality, it is reality which must be studied...and this is fundamental.