I could point to the anti-police rhetoric and victimization of minorities that the left uses as something that the left does that leads to violence (riots or gang violence).

Ultimately, blaming political rhetoric for the attacks of those who are mentally ill or anti-social is either ignorant or straight up dishonest.

This obsession to learn the political affiliations of people who are clearly mentally ill is frankly ridiculous, and giving attention to these folks deranged "manifesto" has much more directly encouraged these events than any political rhetoric.

The reason they write a manifesto before they murder people is because they want to be heard. When you attempt to use them as a political tool, are you really condemning them, or are you actively rewarding them?