Like anyone just up and one day made a value judgement that certain lives are more and other lives less valuable! Liberals are always so ... naive, to the point of utter childishness!!!
Here's an example:
Let's say that I came home today to find someone in my home, holding my wife at knife point. I am going to do WHATEVER is necessary to free my wife and get this guy out of my house. Yes, I am willing to kill him, rather than have him kill me or my wife.
Now ... sane people understand this without explanation. Crazies on the left must pontificate and expound and such. All life is precious (except of course, unborn children, the aging, and anyone else they will gladly kill). But I digress!!!
The guy is an evil doer. He's an aggressor! He brought to me a fight I never asked for! Now I'm going to end it by any means necessary, even killing him. End of story!
Now ... the same applies to all of the groups you name above. Americans didn't wake up on 9/12/2001 and say, "ALL palestinians, ALL Iraqis, ALL Afghans, and ALL Libyans must die." The attempt has always been to separate the aggressors and evil doers from the rest. The Afghan president ASKED THE U.S. to stay! The Afghan president was just visiting the U.S.!
If Afghan life is so cheap, why didn't we just kill him on the spot?