Human nature and an unwillingness to counter it. People are naturally predatory, greedy, devious, ignorant, lazy, or distracted. There are many processes in place to mitigate these. But Political Correctness ignores those behaviors and processes, resulting in the exact opposite of what they intend to achieve. The issue is not between haves and have nots. It is between doers and doer nots.
Edmund Burke, Thomas Jefferson, and a host of earlier leaders have reaffirmed in a host of different ways:
Evil does exist. All that it needs to flourish is for good people to do nothing.
Speaking out effectively requires finding the truth, having the courage to speak and defend, and commitment to not surrender.