Why is there so much sheer hatred on the left today?

My brother and I went to a BBQ yesterday with some mutual friends from our college days. There were abut 20 people there, most of whom we did not know before yesterday. The subject of Charlie Kirk's assassination came up and it was shocking some of the things people said about it. They were literally gleefully celebrating his murder as a good and justified thing given Kirk's political views. There were many things Kirk said that I disagreed with, but does justify his murder? Is that where the left is today... kill people they disagree with? Where does the seething hatred and support for political violence come from in today's left? How did we get here?

Why is there so much sheer hatred on the left today?
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