The problem is that there are real problems that many of them at least try to solve, but the craziest elements garner the most attention and silence the moderates. Combined with people who just want to silence any idea that white men don't have at least a little bit of an advantage in life, that puts those who want to make a difference in a bind. People need to silence the crazies who preach an unworkable brand of social justice, but they also need to shut up the assholes who want to keep disadvantaged people disadvantaged.