It's the volume that I found disturbing. There were Twitter posts celebrating or mocking Kirk's death, using images of his murder, with nearly 1MM likes, hours after he was killed. At the time, it was being reported his wife and toddler daughter had been in the audience (thankfully later revealed to not be true).

I haven't seen anything comparable for Hortman but if I had, I agree I would find those incredibly disturbing too.