Discuss the correlation between mental illness, political beliefs, and violent behavior. Criticize the notion that only Democrats or Republicans are capable of violence.
Most of the shooters are significantly mentally ill.  While the guy who shot Giffords (if my memory serves me correctly) was psychotic, he was a white nationalist, who almost always is conservative.  (Note white nationalist organizations who endorsed Trump.). But the concept that Dems are violent and GOP supporters aren't is nonsense.