I had one show up at the back of my property and me and the family were at the pool..... told my son to go quickly to the house and bring the shotgun and before he could get in the house good it was gone in a flash...lol
I don't ever give my 2 cents.... but I have a son that will be 19 tomorrow and nobody will protect my son while he is alone in his vehicle but him. He has what he needs and understands what it's for in the event it is needed.
Provide your son with the necessary protection that he would need...