The grinning doofus beats the earnest grouch every time. Look it up. We created that, too. Tom Green wasn't created overnight. The stage was set as far back as 1492.
Genocide needs comic relief.
Extreme violence calls for extreme comedy. The Puritans were the first people with guns to settle here. They set the tone. For centuries, there was a no-dancing rule in the New World. Now, to its surprise, America has discovered that it won't have to go to bed without dinner if it violates the rules.