This was a one-off unusual occurrence. There is no available assistance specific to this very case, and there never will be.

If you're talking about mental health in a more general sense, I think most people know what assistance is available, but it can't be forced upon someone.

BTW, terms like "available assistance" and "public education" are code for big government. This was one rotten individual doing what rotten individuals do. Unless you plan on pairing him up with a crazy-buddy to watch his actions, I don't know what could have prevented this. The crime rate will never be zero.