JMO on the left handed thing - my son is also left handed, but I'm teaching him to use right handed rifles for his own benefit. I figure if he can use common right-handed tools most of the time, he'll have an advantage over other left-handers that think they always need left hand stuff. He's doing very well with it so far, and a lot of lefties can become ambidextrous without too much trouble.
You are doing your son no favors whatsoever. You're right though, left-handers have no business wanting equipment that's designed for them. They especially don't deserve the safety features that come along with shooting a firearm the way it is supposed to be fired.
