I think this is the logical outgrowth of farcebook. People get indoctrinated into polarization and take extreme sides right from the start, ready and hoping for a fight. Try to have a civil discussion on YouTube and see where it gets you.
There must be some kind of dopamine high from all of this, and just like the monkey who hits the button over and over for that high, it’s monkey see, monkey do.
All the best,
Nonoise