The flag is a symbol.
Sure it can be disrespectful to burn the flag. It can offend the military officers or the conservatives who see it at symbol of everything that is America.
But this country was founded on the right to protest. I have no doubt that burning the British flag during the revolution was done. Would it be punishable to write an article completely trashing the constitution or the president? No and it shouldn't be, people do it all the time.
Once the institution begins enforcing rules that eliminate protest or any form of non-violent expression against the government, said institution becomes an oppressive state. Look at North Korea...
It is a piece of fabric and anyone who thinks it should be punishable by law doesn't not know much about the principles of the nation.
I can't believe there is a 4 page debate on this issue.