@hawkeye10,
Don't be silly, adults do a lot of things that are not right. The illogic you espouse here is part of the
nirvana fallacy, you might want to look in to that.
Just because adults are imperfect about social agression does not make it a bad idea to teach kids that it is bad. The easy rebuttal to your poor argument is that the
elimination of social agression is not the goal, but that a
reduction is.
Similarly intelligence-challenged argument for comparison:
It is pointless to teach kids not to murder, as there will always be adult murderers.