if you really don't know, then there is little probability that anything i say could be of use to you.

there are people in the world without conscience. i, personally, will sleep a little better knowing this man is dead, it happened none too soon. i will still watch my back because there are a large number of people who, for one reason or another, will allow a person like that to take control, and support him in his aggression.

if the logic of philosophy fails to intersect with the dynamics of the real world, it remains theoretical. just from the statements in your post, i don't think we will agree.

cheering the death of the immoral seems to be an inbuilt, societal control mechanism, which is not expressed by every individual, for demonstrating disapproval of certain types of actions, that is otherwise suppressed by fear. ding dong the witch is dead., and so on. pissing on someone's grave is not generally a solitary activity. it is said and done, usually, with an audience.