The road to hell is paved with good intentions. He could wish all the best to his crew, but if he doesn't have the ability to take decisive action, all is lost, barring an act of God.
I think of genuine pacifists and other conscientious objectors who never raised a fist yet either put themselves in harm's way (during protests, for instance) or accepted jail time if there was indeed a penalty for avoiding conscription. A distinction ought to be made between assertiveness and aggression. These folks are rare, but they do exist.
For all his bellicose posturing (and the genuine threat he represented, to be fair), Evil Kirk was petty in ways that displayed insecurity. Interesting to note is that when it came time to fuse the halves together in order to restore the Captain, Good Kirk was the model of calmness/acceptance whereas Evil Kirk was no longer quite so brazenly macho.