This is the same philosophy of those who destroyed the World Trade Center.
"All Americans are guilty. Kill them all."
"All Afghan people are guilty. Kill them all."
The fact is, most Afghans are just as innocent, and just as much victims of the Taliban/ bin Laden/ al Quaeda as those in the World Trade Center were. If not more so, since the ordinary Afghans have had to put up with these sadistic b******* every day of their lives for years. Don't have a beard? Take your beating. Ankle showing, Mrs. Smith? Take your beating. No food, Mrs. Jones? Tough s***, we don't allow women to work and earn a living. You'll just have to starve to death.
Are you morally any better than the terrorists? By posting crap like that, you demonstrate that you aren't.
Unfortunately, there are many cases where it's impossible to distinguish between the innocent and the not so innocent. A lot of Taliban "fighters" only have guns in their hands because the Taliban will murder their families if they don't pick them up. In that case the best thing we could do morally (which is fortunately the militarily sensible thing as well) is try and provide an opportunity for defections.
If that doesn't work, then we simply have to kill them. By having a gun in their hands (however willingly or unwillingly), they are a legitimate military target.
There are also many occasions when a military target is so important you have to just take it out even though you know in advance there are going to be significant civilian casualties as well. In that case, the moral responsibility for the murder of innocents lies squarely on the Taliban who, by their actions, put them in harm's way by creating a situation in which they knew their own civilians would be killed.
But there's a major difference between those scenarios and what you propose. Don't dare to suggest we ought to just casually machine-gun (or nuke) innocent civilians and then pretend to be moral, or a good American. The fact is, if you seriously propose this, then you're morally no different from the al Qaeda thugs. Or the Nazis, for that matter.