So I can’t think of a single time that mass murder/shooting /killing has fixed things. Changed things maybe – but it happens again . There are always others, there are always enemies,there is another group of extremist.
Yet somehow, we raise people that believe that killing lots of people will make what they don’t like go away.
I don’t think killing is ever more than a short term solution. State sanctioned death ( aka the death penalty) stops one person, but doesn’t prevent a problem. Even killing that person that was going to harm you – only stops that one person. This is ot a judgement on defending yourself , but it just isn’t getting to the root of the problem.
We accept that killing is something that people do.