Identifying with an idea only makes the ego vulnerable to the truth.
An "-ism" is a lens through which to see the world. An "-ist" is someone who identifies themselves with a particular lens. Because there is likely no "-ism" that is absolutely true, the more "-isms" you understand and can view the world through (even if you don't personally agree with them) the closer you will get to understanding the absolute truth, which is asymptotic.
You could say that this idea could be called "ism-ism" and that I might be an "ism-ist". But there's no reason to be an "-ist" and identify oneself with a lens, even if one has a preferred perspective that feels logical. Identifying oneself with an idea only makes the ego vulnerable. It causes a perceived threat in the mind of the believer when they encounter something that contradicts their chosen "-ism."
Therefore, one must be careful when evaluating personal values. Understand your own priorities and be cautious about your convictions; these are choices. Your beliefs are opinions, not facts. While not all beliefs are congruent, logically coherent, or supported by empirical evidence, each one still offers a unique perspective of the universe.
Try to understand everyone's perspective. Study all "-isms" and treat them as lenses to pick up, look through, and put down at any time. You can even use multiple lenses at once. In this way, you can detach yourself from your beliefs while still understanding your personal values. Instead of having "beliefs," you have a collection of narratives that you have intentionally selected because they make sense to you. The lenses you use are simply different ways to see the same thing we are all a part of.