Getting dozens of calls threatening to kill you, having your kid's pictures reposted all over the internet, and getting doxed are not how I would describe "a crusade against fake news". This is hardly new. Swatting, gamergate, etc are all manifestations of similar things. Why are you so dismissive?
Internet mobs are easy to rile up and difficult to control. Each individual participating only takes one minor action (for example calling and yelling at the other party one time) but the victims of the abuse suffer a massive torrent of hate and slander with basically no recourse. People get fired because their employer doesn't want to deal with the harassment or bad press.
For a long time a simple accusation was enough to get the mob going. Now you don't even need that much, just some conspiracy-mongering and a few likes on Facebook and you too can send a mob after anyone for no reason at all!