re: How is that statement useless?
The idea that if everyone was nice, or understood how justice should work, we wouldn't have any problems is one of those concepts that is perfectly true, but has no effect in the real world.
It's along the lines of saying if everyone has all the money they needed, there wouldn't be poverty. Again, a completely accurate statement, but so what?
It's obvious there are an enormous number of people out there whose idea of justice or dealing with other people is totally incompatible with ours on a very basic level, and I don't think we're going to be able to sit down with people like Zarqawi and others and talk them into being Good Little Spiders.