I handled guns starting at 13 yrs old, and not one of them went on a shooting rampage while under my control.
My high school parking lot was full of trucks that had gun racks in the back window, and most had a shotgun and a rifle hanging on them.
Nobody locked the trucks doors or rolled up the windows in warm weather. Not one of those guns committed an act of violence against a person or was stolen.
Shotguns used to be carried into the school and kept in your locker, because you were going hunting after school. Teachers were known to stop by and jaw jack about a students shotgun, while standing in the hall way holding it. Never harmed anyone.
I believe it is the Democratic party mental illness that has destroyed those values and the decline of morals.
The Highland Park shooter appears that there were all sorts of glaring obvious mental health issue's/warnings that his parents nor anybody else paid attention to.