Mostly just posting this to bookmark it:
Another new study not only once again shows there’s zero correlation between mental illness and shootings, but it also finds far better predictors for gun violence that are shockingly mundane. … Having a mental health diagnosis – whether it’s a mood disorder, PTSD, borderline personality disorder, or schizophrenia – doesn’t make you more likely to threaten somebody with a gun. What does [make you more likely to threaten someone with a gun] is simply knowing you have access to a weapon.
Source: Yet Another Study Shows Why We Really Need to Stop Blaming Mental Illness For Gun Violence
