[HoundsTooth_BP]

If by answer you mean point out the glaring flaws in the “US should be policing the world” theory, then yes...

[TigersEye]

If its our job to attack aggressor nations then why didn’t we attack the Soviet Union or China? Why do we only attack nations when its politically expedient for the President in office at the time? Why aren’t we trying to occupy all of Africa right now?

The answers to your three questions clearly show that the U.S. does not engage in a "global policing policy."