Imagine you are an employer. You find out that the person you were considering for hiring is a relative of the shooter. Fearing any risk, you decide not to go ahead with that person.

And for parents of murderers, it's not unheard of to get personal threats.

I don't think a competent employer would make that leap in logic.

And I'm not sure about families of killers getting death threats. In America, we have a pretty solid understanding of individuals, and individual's actions. Society generally just wants to move beyond the incident and somehow better ourselves. I'm not sure where you're getting that idea.