I wouldn't say Americans are like that. It's leftover TV laws from way back. The thing is if someone wanted to change it you're going to get the same super polarized opinions of anything else. You'd have one group that wants to allow and encourage anything and everything so they can put tranny porn on kids shows. Then the other group would want to require long pants and dresses. So, the rest of us just say "fuck it leave it alone." That's beside the fact with what all else is going on that we'd have any desire to spend energy worrying about broadcast TV laws of all things.