As I read these posts for and against a thumb safety on an M&P no one has mentioned children.

I am a responsible gun owner. My Shield is always holstered and when not on my person it is locked away in my Gunvault. However, accidents happen and children get their hands on loaded guns. I like the idea that if a child pulled the trigger on my loaded Shield it would not go bang and hopefully I would realize my error in judgement (leaving a loaded gun unattended) before the child figures out the safety.

Russ