Why do every type of organization turn bad in the end?

I've noticed that any organization that was originally against people getting discriminated and having fair rights always goes sour in the end. All of the sudden, it's purpose gets destroyed and extremists are created. Those radical, extremist (fanatics) make the movement look terrible and all of the sudden it's about superiority and not fairness

Feminism, BLM (certain have become just as bad as the former Ku Klux Klan, the same similar sense of superiority, getting violent and wanting attention just because of your race), Men's right, etc. Then LGBT will soon be steps away from becoming that too; all of the sudden certain gay people will try pushing their sexual orientation on us.

Why do every type of organization has that effect? It always turns radical.

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All of the sudden, it creates individuals with such an inflated ego willing to trespass people's boundaries and it's not about fairness anymore.
Why do every type of organization turn bad in the end?
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