Check out this article, Social Justice Bullies: The Authoritarianism of Millennial Social Justice.
Why does so much social justice rhetoric seem intrinsically authoritarian? The author above attributes it to a series of Orwellian sophisms.
While the argument is a worthy one, I think the underlying cause is a little simpler: some people are just bullies. They like to be enraged, part of the mob. It makes them feel good.