By you I guess you are referring to that straw man over there.
And I am guessing you are being deliberately provocative and obtuse.
If you do not enforce positive behavior and proper manners when they are young and semi-controllable, then you perpetuate barbaric and uncivilized behaviour when they become adults.
However if you prefer such antics, I believe there are quite a few available homes in Detroit where you can be subjected to the fruits of such antics from more older kids, usually traveling in packs, 24/7.
Enjoy.