Actually...due to some past problems...BSA has good systems in place that protect everyone better than public school teachers, coaches, youth group leaders, and your local priest. 

1. No adult leader is to be alone with any scout, male or female.
2. Every leader is youth protection trained.

Yes, a predator would try to find his way around that and anything is possible, but I would submit that kids of any gender are safer around scouting than their P.E. teacher, coaches, or youth group leaders. 

Every leader is trained to be on the lookout and families are encouraged to participate.