So far, I’ve never met a wingnut who used the “mental illness” defense who didn’t think that the “solution” was to just lock them all up. Not better screening, not more programs to help them, not even spending on more counselors or better access to medications. Just throw them in the loony bin and lock the doors behind ya, because they’re “dangerous” and can’t be allowed out in public.
It goes without saying that none of them believe they’re in any way “mentally ill” because they don’t want to shoot anyone dead…today.