Which is why we have childproof bottlecaps, playground carpeted with soft bark and hard foam, and crossing guards/school zones/crosswalks.
But requiring guns to have trigger locks is the first step on the road to tyranny.
But why make locks a law? Leaving a dangerous object in a child's reach is reckless. Laws aren't going to make accidents go away.
So it's okay for a parent to leave a bottle of antifreeze sitting open on the counter because if a kid mistakes it for Kool-Aid, oh well, accidents happen?
Would it be ok to exploit that accident to try to ban, or restrict, antifreeze?
I agree with you that the issue here is the negligence, not the gun.
The problem is that we don't punish negligence enough. The parent and the owner of the gun should be going to prison for several years for manslaughter. If people understood that those were the consequences they could possibly face, they may be more careful.