I don't think his motives are strong, equating freedom of speech to the burning of symbols. There are many more ways to express ones self, minus the angry mobs. But one cannot argue with someone who is correct in their own mind.
Yet, I was wondering... Where did this burning occur? If it was in some sort of public forum, then I'd see politicians debating about it on TV, hear it on the radio, and posted everywhere online. If he really wanted to make it a statement, he should have done it in public, preaching his manifesto to the masses. If he is correct in his rationalization, then he should explain his motives to those who believe he is unjust and take their scorn in stride, as long as it doesn't lead to violence.
But the only thing that really bothers me is the whole burning thing... I believe it's silly to burn things, even if it's a statement. I don't see this situation as "a man who burned a sacred symbol", but as "a man who endangerd himself or quite possibly others."
Anyway, I believe it is a publicity stunt like the whole SNL, Sinead O' Conner, Ripping of the Pope's picture thing. An act that seemed justified to herself, causing major backlash from those who disagreed.