Alberto Attended a Demonstration by Mexican-Americans in Douglas, Arizona, Which

Alberto attended a demonstration by Mexican-Americans in Douglas, Arizona, which was held to demonstrate against laws allowing law enforcement officers to stop any vehicle occupied by Mexican-Americans without probable cause for the purpose of verification of U.S. citizenship. During the demonstration, Alberto lowered an American flag that was flying in front of a private business. Alberto removed the flag and tossed it onto the ground. He then soaked the flag in lighter fluid and set fire to the flag. Alberto taunted anyone standing around or passing by in a motor vehicle to stop him from committing the act. What crime or crimes did Alberto commit? What charges may be filed against Alberto, if any? Would any American be within his or her rights to physically assault Alberto in attempt to stop him from removing the flag from the flagpole or from setting fire to the flag? If not, what charges could be filed against anyone who chose to comply with Alberto's taunt and engage him in a physical altercation? In your opinion, should a person be allowed to burn or desecrate the American flag or any state flag? If so, why? If not, why?