Acting on extremist, especially violent extremist, ideals and carrying out physical violence against other people or repressing ideas contrary to the worldview you espouse, IS morally wrong.
So you are claiming that the US Army, fighting to promote democracy in Iraq, is morally wrong?
I think it's not morally wrong to kill for your cause, but only morally gray. What decides if the killing is okay is if the cause you are killing for is morally right or wrong. That, well, we can't really decide.