In my honest opinion, yes you can and you should. When Lacy scored there was 10:58 left on the clock. 10:58!!!!
That is an eternity in the NFL and is kind of my key point here. With 8 or less minutes left in the game, my tune completely changes about going for 2 but with 11 freaking minutes left in the game that is more than enough time for a team to score another TD and a FG.
Anyway, I do understand your points but at this point I think we will just have to chalk this up to a agree to disagree conversation as I don't believe either of us is going to chance the others mind!