No, it doesn't.  Not one bit.  Because he also constantly talks about the sanctity of life.  He sat back and let thousands of people die horribly just to prove a point.  That is not Optimus Prime, that's a sociopathic monster.  And those people in Chicago didn't get to choose anything.  Heck, that's why I kind of understood Titus Welliver's character's anger in AOE.  Optimus Prime doesn't let innocent people, who have NO say in the matter, die needlessly without trying to do something to save them.  Oh and the Autobots were essentially lapdogs of the US in that movie.  Attack other nation's soldiers without provocation, because MURICA is awesome.
		
		
	 
This is the same absolutist mindset that imo wouldn't let people get around various plot developments in MOS. Superman believes in the 'sanctity of life' thus he wouldn't. As if there is some stride for moral perfection. Ignoring how violent he is to criminals with rights, that he resorts to violence in the first place, that he lies to almost everyone on a daily basis, that he acts above the law, that he's fudged his citizenship...etc. Point being, absolute statements get us nowhere. 
As far as optimus, the people of chicago didn't have a choice, their leaders did, as is the fate of mankind since the dawn of civilization. If optimus let's that system run it's course as a benevolent higher being he will be in the moral clear. Secondly, it's not like he actually left, not sure how many millions more lives he would have saved if he simply sat in chicago with his arms and legs crossed and gun in his lap. There tends to be massive fall out in all the battles regardless. The point is telling the voted world leaders that they can take their freemdom of choice and screw it absolutely makes the autobots no better than the decepticons. It's a matter of idealism. I'm sure Rorschach would approve. It's about striving for what's 'right'. An entire world voting you away by way of democracy and telling them to shove it...not sure if even superman would stay on earth in that situation. Then again, it's not like they left. 
	
		
	
	
		
		
			That's also the reason why i have no idea why the Autobots would be working with the Government to fight terrorists in the beginning of TF 3, they were openly taking sides among human countries.
		
		
	 
It's a dubious question. 
Global matters are never cut and dry but there are somethings that are more so. For example would the autobots help the allies fight the axis(Hitler)? Down the scale would they join in the hunt to find Osama if they could?
I'm sure they wouldn't walk in take out Kim ill in NorthK just cause MURICA says so, but I'd imagine it's at the moral level of complexity of gi joe. Themselves not actually messing with north korea but they do like to punch the "evil terrorists" in the face. Dubious at the very least I'd say.
The thing is, even world leaders vote in the 
majority against 'terrorist' active terrorist outposts and such(if that is infact what they were attacking). And prime very much was at the beck and call of 'the world leaders'. I've only seen the film once so this is all speculation.
don't mind the derailment.