I’m certain that in your eyes I’m a horrible parent, but my youngest children, now young adults themselves, spent many a night, weekend, taken trips etc with a woman who happens to be HIV positive. I completely lack your sense of paranoia concerning the disease.
Big difference. She's not a teenage boy. The odds of her getting into a fist fight with your children was practically nil. Children also don't have the same sense of hygiene and safety that an adult would have.
It is insane to put a TEENAGE BOY, who is infected with anything deadly, in a dorm room with 10 other kids.