But it isn’t a good point absent the bad assumption that the mentally ill are more dangerous. It only takes one bicyclist that’s fallen off his bike to kill you. So what?
This is a symptom of people being to primed to believe that mentally ill people are dangerous, not a legitimate cause for concern.
Purple call the police on someone yelling. A mentally ill person yelling isn't a danger. They might be in crisis or pain, or they might be unable to effectively communicate.
A gun didn't help in any of those, the vast, vast majority of cases.