I am sorry about that one murder everybody is talking about:
I am sorry about the possibly otherwise nice¹ person who has decided to kill another human;
I am sorry about the potential celebration of the dead person as a martyr, and consequential further spread of his ideas;
I am sorry about the further normalization of violence as a political tool
I am sorry about the potential for more violence as a reaction
And it's a minor thing, but I'm annoyed at the fact that these days I keep reading what for me is the name of one of the Captains, and it's that person instead :)
Things I'm not sorry about include:
One dead asshole (good riddance)
¹ afaik there is still the possibility that it was some other fascist from a rival faction or whatever