Idealism.
There is only one reality, and one truth. It may be very hard to know, but it IS, and it is ONE. Because reality is vast, or maybe even infinite, there is a great urge to cling to some idea, some saving angel of simplification, some universalism that can point to what must be done in order to make sense of it all. And in that darkness of uncertainty the voices of those that seek only power whisper to us: believe in this, and go to sleep. And then Idealism sprouts, placing ideas and words ABOVE REALITY, and demanding that the little truths of reality must be suppressed, molded and "spun" to fit the Ideal. The moment a society accepts that it is already dead, although it may go on for a time with much of the appearance of progress. Only truth (= reality) can, and will, set you free. True freedom goes hand in hand with knowing truth, and acting on the basis of reality. Idealism is for the suckers who enable domination tactics.
Infinite many evils that have varying outer forms begin with an innocent-sounding Ideal.
Such as...
Equality.
There is, and never has been, such a thing as "equality". All men always look for the best-looking, fertile women. All women always seek powerful, charismatic men. All companies always look for the best employees. All employees always seek the best business for their career. All armies always look for the best disciplined subordinates. All intelligence agencies always look for the most skilled and balanced individuals.
NOTHING is equal in reality. Nothing and no one is ever equal to any thing else. Equality cannot exist. The only equality than can be achieved between two things is the complete destruction of both of them.
Hell is full of egalitarian Idealists running away from cannibal rapist hordes of "equals".
Tolerance.
Toleration is only of evil things, or things one severely dislikes. To fight against pain with exercise and medication is to be INTOLERANT to it. To struggle against poverty with labor, discipline and education is to be INTOLERANT to it. To battle powerlessness with networking, mind weaponization and realism is to be INTOLERANT of it.
Those who promote "tolerance" are ALWAYS INtolerant of any opinion, instinct, organization, symbol, or belief system that deviates even one nanometer from their intolerant Ideal. Tolerance is a euphemism for perversion, immorality, brainwashing, disrespect of the normal majority. That is why it can never last long, because the anti-society elements it lets exist undermine the society that enforces "tolerance" against the instincts of its normal citizens. Everyone deserves what they tolerate.
Imagine if surgeons would work the way Idealist social engineers work.
Patient: Au! My tumor really hurts!
Realist doctor: We have to operate, please come into the surgical...
Idealist doctor: No, no, no, you are being biologist!!! All life forms are equal. The solution to your "problem" is to not talk about it. You WILL refrain from mentioning other life forms in terms of the "t" word, "infestation" and such VILE TERMS, and you WILL tolerate, or else you will be thrown out of the hospital.
Patient: You mean I can then go to another hospital?
Idealist doctor: These rules now apply to all hospitals, retroactively.
Patient: Oh. Au.
Realist doctor: Hey "doc", didn't you have a very real operation on YOUR tumor last year?
