These things start out attempting to correct an injustice and then take on a life of their own. Unscrupulous people see it as a career opportunity under the pretense of moral righteousness. This is exactly what happened in the Soviet Union in 1930s. All the evils were done in the name of correcting injustice and helping the oppressed.

I'm in favor of correcting injustices, obviously. The problem is with the opportunists.