This sounds great in a general handwavey sort of way except for the fact that (at least to my knowledge) there's no evidence tying the alleged Minnesota assassin's motive in any way to the death of Brian Thompson.
He does appear to consider women's healthcare a form of "violence", however. Should we examine our consciences and outlaw women's healthcare in case people like this take offense and start a civil war?
We can wring our hands and try to find ways to make everything our own fault or we can accept that anyone under enough pressure can become violent, regardless of whether they believe themselves to have righteous intentions when they do it.
Relocate anyone with a net worth of >$500 mil to the bottom of the Mariana Trench.