I'm not a fan of trigger locks. BUT I am a big fan of secure storage of guns -- a safe, lock-box, secure cabinet, etc. We have safes and lock-boxes here at our house.
You can teach your child everything there is to know about gun safety, and he or she can be as safe, or safer, than you are. But he or she have friends who will visit; or you will have guests; or there will be workmen in the house at some time.
It's not about the law or the penalties you might face for not complying. It's about what you can do to possibly avoid something bad happening.