From an idealist perspective, yes. I want to be able to believe that the law holds everyone equally accountable and no one should be above it.

However from my current realistic position, I know damn well as do we all that they law already doesn’t hold everyone equally accountable – not even close. And the fact that the deceased made a living doing what he did is just exhibit A on a very, very long list of examples. The rule of law has clearly already broken down, which means all bets are off. The fact that it’s been doing so slowly over the course of decades rather than in a single coup or hypothetical night of broken glass is completely irrelevant.

Furthermore, even if the shooter is prosecuted I feel that “this was clearly in the best interest of society as a whole given the harm that the deceased was still actively inflicting on thousands of people” should be a valid legal defense.

Most jurisdictions already allow for the use of deadly force in defense of yourself or others against a perpetrator who represents a clear and present danger to the safety, health, or lives of others. This is just that, but with an extra logical extension riveted on.