[IF the father gave him the seized firearms and one of them was used, he should prosecuted.]
This is shades of Sandy Hook where the stupid mother bought guns for the psycho son.
The father as you say should be prosecuted because he knowingly supplied guns to a prohibited person.
Crazy Adam Lanza killed his mother and stole HER guns and used them to attack Sandy Hook Elementary School.
Her foolishness was taking her nut job son to a gun range, and having firearms in close contact with her deranged son.
One press report said than Adam Lanza had a massive chart detailing all the mass shootings that had happened previously.
One would think that would have been a big red flag for the mother, but n-o-o-o-o.
It was also reported that Adam Lanza wanted to shoot up the high school but was deterred when he saw a police car in front of the school.