@selzero Murder is always wrong. The victim can be a terrible person (and likely was in this case), but violence isn't the solution.
The U.S. already has too many people who think they can settle any problem, personal or political, with the barrel of a gun, and the death toll from mass shootings (orders of magnitude higher per-capita than other other rich country) tells its own grim story. I think it's irresponsible that some people online (not you) are celebrating and encouraging that.