What's wrong with that explanation? Not being sarcastic, but it is perfectly sensible. If any invasion is to be done of any where, wouldn't you expect that it would be in our self-interest? Oddly, money from oil would be the last reason for invading Iraq; we're losing money. We could have simply lifted sanctions if we wanted that oil. I think the calculation was made (incorrectly) that it would help us in other ways.

Lots of people are suffering under oppressive regimes. The US obviously can't help all or even most. So wouldn't attention be limited where US interests are most keen? Who would do it any other way? Also, as another poster pointed out, invading Myanmar could touch off a world war involving China. It's not Iraq or Afghanistan.