I think it's the fact that true tolerance would allow the burning of any book. Not all copies, not banning it from circulation, but the burning of an individual symbol as a means of expressing an idea is perfectly fine in most Americans' view. I share that view, I understand the nuance of the situation at hand, I'm aware the quaran is a holy book and that it sends a strong message.

But so does burning the American flag, as a symbol, to show that America's ideals and values are dead or do not apply for the people doing the burning. American flag burning was done with the intent to express that the symbol of freedom and equality that it was pushed as was not at all representative of the America those people were experiencing. America has a problem with nationalism, so much so they tossed "under god" in a "non-mandatory" (socially reinforced) pledge of allegiance you say every day before school starts all the way until you graduate. You can imagine burning the flag pissed those nationalists off too, but their vitriol and frustration is useless and unwarranted.

If you say the culture of Islam, or the culture of the people who see that book as their most holy symbol and use it to justify violence, is unwelcome in your nation, as an individual, that's completely fine to me. I don't love the blanket statement, but I do love that you can express it without fear of retaliation from your government and with the knowledge that you are as safe expressing that belief as you are expressing one more widely agreed upon.

If I disagree with you, I should debate you, i should seek to educate you, or be louder than you with my actions and words. That's not the way of every place in the world, but it is the way of any civilized people. Any who condone violence in response, even provoked violence, are closer to animals than their fellow man.