The unaccompanied adult-size teens can be a little unnerving, never had a problem but it takes some of the fun out of it, the passing thought of being assaulted or robbed.
Some of those youts don’t even bother to wear a costume, scary enough without one.
Couple years ago one black male went through daughter’s neighborhood dressed as a pimp, purple jacket gold hat with giant feather and walking stick. He had two little white girls with him dressed in fishnet and short skirts with heavy makeup. Talk about scary.