Aren't people presumed innocent, even as they look odd? Do we want to live in a country (Iran, Russia) where people could judge us by our looks?
Sounds like calling PA guilty. He was found guilty of nothing.
I'd advocate to watch your children vigilantly, better than ever, be timely at drop-off and pickup, warn your children, keep them in groups, volunteer at their school, eyes wide open at all times.
Don't go on with unfounded accusations.
What if your (hypothetical) family member was falsely accused and it proved nothing? What then?