At what point in that small reply do you see him saying that?

The entire comment. The topic is fearing for one’s life and defending oneself with a gun, and this guy basically says that it’s right to fear for your life because someone might be mentally ill. Comment again so you don’t have to scroll up:

I feel like every person in this thread that cannot fathom how he feared for his life has never had personal experience dealing with someone with severe mental illness, in their family or in public or something. Direct experience, though, of interacting with a large, loud, mentally ill person.

If you think you can just assume a stranger you encounter who shoves a phone in your face is mentally healthy, you’re missing some facts of life.