Because they deal with these morons every day. That one guy who says something negative about someone so instead of just ignoring it or just let them be an idiot on the internet. They confront them and they look like either morons or saviors infront of their white knights.
It also doesn't help if the person is trying to sound like they are "THE VOICE OF FUCKING REASON" because then it enforces an imagery of childish behavior to do something because "that's the right thing to do". Assholes exist because of high brow asshats who basically wanna be a hero every day and try to go against injustice.
Also it doesn't help from a business perspective is kinda the eco-environment friendly switch blade. It's great that you're building wind farms, but at the same time it just makes a bigger debt in your budget.
So why is that? Because social justice advocates have this motto: "FUCK MONEY THATS WHITE PRIVILEGE AND WE GOTTA STOP BEING WHITE AND HELP OUR CAUSE OF PEOPLE NO MATTER WHAT HAPPENS. "
That absolution attitude is why most SJW basic business pretty much fall apart sooner or later.