Somebody needs to clue this guy in that evil exists in the world. You cannot protect people from everything. Random violence will never be eradicated. If one of the victims had been CCW the problem would have resolved itself.
I wonder if the father or his Doc knew he had guns?
If you had a 22 year old son within 100 miles that was threatening himself and others wouldn’t you go and confront him? This father had the means to get him at least temporarily committed. Then he could have searched his place and taken his car etc.