I know that somewhere in the United States, some hate filled radical will most likely burn an American flag on Flag Day, in an attempt to puff their little ego and get some media attention.
Twice, the Supreme Court of the United States has struck down flag desecration laws. This means that the government of the United States is unwilling to stop those who befoul the symbol of the American people.
And when government takes the side of the criminals, and refuses to stop their violations against the citizenry, these same citizens are obliged to take matters into their own hands.
If you do so, be aware that except in the most liberal enclaves in our nation, it is highly unlikely that a jury of your peers will convict you of any crime. And knowing this, few public prosecutors will even try to prosecute you, for anything short of manslaughter, in defense of our flag.