Unlike hate speech or defamation, when some burns a flag no one is actually hurt. Some people may feel their sensibilities offended by such acts, but making people feel uncomfortable should not be illegal. The act of flag burning is in itself neutral. The direction of the message the act is meant to convey is what must be considered, not the act itself. Prohibiting flag burning is in this sense pointless. Furthermore, it should be within someone's rights to challenge the values of the nation and to destroy the symbol of those values as evidence of their disagreement. If people cannot challenge those values then society is not free at all.