"Effective genocide program!" I love it...

Your point is well made and mentioning the western US (Eastern, too for that matter...) shows that genocide may leave residual problems which as Steve Blair pointed out with respect to earlier Spanish experience, "...didn't do them much good."

Which is why I pointed out above that 'population control' is not likely at all and in any even if implemented, will not last long -- lacking the Phrase of the Week.

Bob adds this:
"This does not mean cut and run, it means that if we are so set that we have national interests in these places that demand our presence, lets use our influence to enable a relatively controlled evolution of these governments and not simply help them keep their populaces in check."
Truly good statement. More to the point, influence is better than force -- and once you've escalated to the point where you've committed the GPF it is not ever going to be nice or tidy or easy or cheap. Ever...