[CJefferson]

What? Are there billion dollar companies with huge staffs who are constantly trying to figure out how to sneak my child a gun all the time, at school, wherever they go?

I'd say this comparison is good -- we as a society have decided that people who provide alcohol, guns, and cigarettes are responsible if children are provided them. You don't get to say 'hey, you didn't watch your child, they wandered into my shop, I sold to them 2 liters of vodka and a shotgun'.