What a silly law. Why don't we fine people $50,000 every time they do anything irresponsible or dangerous. Surely that
would make our society safe and responsible!
Seriously, no one is going to pay heed to this law because how would you ever get caught? No one thinks their kid is going to get into their guns, if they did they would do something to prevent it. I can't believe you actually suggest that someone would care more about a $50,000 fine than if their kid shot themself or someone else.
I don't own any guns now, but some of my earliest and fondest memories are of shooting guns with my dad. I think it started when I was seven... I was never allowed to use guns on my own, only with strict supervision with safety gear etc.
If the government was really worried about children getting into guns, they wouldn't set up a bunch of pointless fines, they would start an educational campaign (maybe even get the NRA involved) reminding people that if they have guns they should secure them and teach their children the dangers of guns etc.
Honestly its not that hard, get a cheap gun safe, lock your guns up, keep the key on your key chain. Be an actual parent and educate your children. Problem solved.