Actually one side did.
The others were dead before they knew why.
And the very fact you are giving credence to a murdering lunatic's claim implies you are excusing his actions. There is no other reason to take his charge of having his feelings hurt seriously.
>>And the very fact you are giving credence to a murdering lunatic’s claim implies you are excusing his actions.<<
That is your inference. It is also incorrect.
All people think their actions are justified - even someone committing suicide. That’s why they do them. But often their position is purely their own and no reasonable person, based on the body of evidence, would agree with them.
That said, when I read about this sort of thing it reminds me of what the main character in “A Christmas Story” finally did to the bully. It happens. I’ve seen it happen. I’m not saying it is what happened here. I am saying it is possible, based on what those of us not directly involved actually know.
It in no way justifies what this guy did.