I see your point. I have friends that put GPS trackers on their kids "just in case they get abducted by a sexual predator". It does happen that kids get taken, however it's more likely that they get hit by lightning... and a GPS tracker wont really protect them anyhow. The absolute majority of abuse towards children are also done by people that are close to them (parents, relatives, teachers). I have put a lot of time and effort into building a relation with my kids where it's ok to talk about anything. My oldest have also been practicing self-defense for over 5 years now.