The things you listed have always been with us, sure. What we’ve lost is the ability to see objective truth. And maybe people celebrated senseless killing in the past too and we just didn’t have access to their sick mentality before the internet.

Mobs of white people (including children) used to gather around the town square to hang black people. They would literally have picnics while doing it. I feel like the majority of our population is historically illiterate. On the scale of senseless killings, this doesn't even rank.