The problem here isn't that people get sad when they see a book burning. The problem is that the very same people think it is legitimate to start riots and try to murder others because said feelings where hurt.
When you are on the same side of a strictly moral debate as glourious humanitarian superpowes such as Saudi Arabia and Iran then you really should take a moment to reflect on how you ended up there.
Iran as a reminder have just in the last year publicly executed hundreds of women and non heterosexual people for "indecency". In most of these other countries that are demanding action against quran burnings it is punishable by death to be gay. We haven't fought for equal rights in Sweden just to have som religous beardman in Teheran to dictate our social policies.