They aren't as bad as American children, because in other cultures they're taught from an early age how to behave appropriately around other people. In America

They aren't as bad as American children, because in other cultures they're taught from an early age how to behave appropriately around other people. In America, parents think their kids are special snowflakes and should never be disciplined, so bad behavior is rampant. The culture in America really is different from other places, as much as you might refuse to believe this. As for "structures and connections", that's a ridiculous excuse. Sure, when children are infants you can make that excuse because they're really too young to learn almost anything. We're talking about kids that are 5-10 years old here. Differing upbringing doesn't somehow magically take effect only at age 18.