I agree with your husband on this. The best cure is a prevention. I never allow my daughter alone with any male regardless of relationship. NO EXCEPTIONS.
I get a lot of crap from family on this behavior but I just very calmly scratch my nose with my middle finger....
In the above situation, I think girl's parents need their A**** kicked for this.
You are very right. If I have a daughter (son even), I wouldn't let them be with anyone except her Mahrams or maybe some of my closest friends who have gained my trust over the years. Still it can happen to anyone regardless of how careful you are.
I hope t never happens to any child/parent, as it can literally destroy the child's life forever. However, if it does happen (God forbid), I would break his ribs, cut him into pieces and feed him to dogs. I would!