You should look at the law! It's so a child of...five? can't pull the trigger. Ultimate nanny state, or life saving device? I don't let unsupervised children fondle my firearms, and in these days of biometric safes, and comfortable holsters, I don't understand why Americans (from Massachusetts) do.
I don't know if there's a stat on trigger jobs in Massachusetts out there, but I bet it's a good one.