Good essay in Counterpunch.
http://www.counterpunch.org/2012/06/26/the-evils-of-humanitarian-wars/
The article concludes:
If the West succeeds in its slow-motion, proxy intervention in Syria and disables yet another Arab state for refusing to toe its line, the stage will be set for the next war against the next target: Iran.
That is not an argument condoning Assad’s continuing rule. Syrians should be left to make that decision.
But it is an admonition to those who justify endless meddling in the Middle East in the service of a Western agenda. It is a caution against waging wars whose destructive power is directed chiefly at civilians. It is a warning that none of these humanitarian wars is a solution to a problem; they are only a prelude to yet more war. And it is a reminder that we have no right to play God.