I mean you mock this daily but -

outrage?
My personal feeling on the situation is that social networking has created the extreme nature of everything. In the pre-social media, or hell even in the pre-internet days every village and town would have a few idiot wack-jobs that would proselytize folks in their extreme beliefs at the local watering hole or at a local government meeting. Most of the town would have a chuckle and ignore said idiot, maybe a handful would join their cause, but by and large nothing ever came of it.
Fast forward to the information age and now the wack-jobs from every village found a way to communicate and share their lunacy with others who felt the same and where they were isolated they became a community of wack-jobs. These communities of wack-jobs grew in presence and numbers online meaning that normal discussions couldn't be had without said wack-jobs tilting things to the extreme.
So when normal people use the interwebs they see nothing but extremes and said extremes have become the new normal. Well these wack-jobs can't be normal so they then had to then turn the extreme dial to 11. Everything is the worst / best ever. There is no grey area or area for discussion. It's you vs me based on your beliefs and as studies have shown beliefs are extremely hard to change even with factual evidence being given - see anti-vaxxers and flat-earthers.
tl;dr - the internet brought together groups of wack-jobs that had previously been isolated and brought about the extremes you're outraged

over.