Kids are kids, if they feel the rage then there is just about no parent in the world who can stop it happening.
My kids tend to be fairly well behaved but i also appreciate that they are kids and they are not just robots who are pre programmed to be polite, sit still, only interact when spoken to first...many people seem to forget this and that they were kids too.
Even the most well behaved kids have off days, as do adults, and to be fair some adults are worse than most kids.
The plane example is a good one, yes it isnt nice listening to a child playing up on the plane, but its even worse sitting behind an ignorant old sod who insists on having their seat reclined, or sat behind a very large person who does the same....dont get me started on the idiots who are blatantly drunk on a plane.