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.
Mr. GG2 just commented that if it was his kid he would have gone over there and taken the guns away from him and had a real life talk about serious psychiastric counseling.