Protest that involve burning the flag of a country are not normally aimed at the ideals that the flag may represent to the people, but as a protest at the actions of that countries current administration. People burning the stars and stripes at the moment over Dubya's dubious middle Eastern policy are doing it as a protest towards him and his administration (which IMO have little to do with the founding precepts of the US).
I guess I can't imagine the impact of a flag burning as much as some others, cos I'm not a nationalistily inclined person. Outside of sporting events.
I was born in Britain. Big deal. Doesn't make me a better person.
