Well, I'm afraid there is only one way to stop this and other worrying Internet trends like the rise of the alt-right, fake media, stupid and harmful theories and conspiracies gaining traction and so on.
As Dawkins put it in The Selfish Gene in the 70s, it's not the best idea that prevails, it's the one that is the most memetic, i.e. is the most likely to replicate. Sensational news, outrageous theories, banned content, all have a better ability to replicate than well researched facts and data, which are slower to acquire and put into the world and are also, generally, more dull than fantasy.
I know none of you will like it. But here it is: content creator real life identification. You want to post something on the internet in places of high traffic like YouTube, Facebook, news sites etc., you own it by signing it with your real credentials - so there is, again, accountability for words (and images). In the case of juggernauts like YouTube, there probably needs to also be a fee to post a video - the proceeds from this should pay for an army of moderators.
You got it backwards. The Internet needs to have as much privacy control as real life does. Because as it is, Internet is just a game of shadows with total anonymity for those who seek it. And those who seek TOTAL anonymity are more often than not societal disruptive forces.
It's a case of 'this is why we can't have nice things'.