Just in case that's not clear, let me repeat: it's a really, really bad idea. I do not in any way approve of anybody burning or destroying something that is sacred to somebody else.
If you're one of those radical, intolerant Christians who want to destroy something sacred to somebody else, you're not alone. In fact, you're just like the people you claim to hate the most. The Taliban destroyed buddhas, including the ancient and irreplaceable Buddhas of Bamyan. And as for Al-Qaeda ... maybe you've heard of the World Trade Center. Burn some Qur'ans and you'll be in great company.
We're better than that. We let people dissent. We know that a few bad people, like Qur'an burners, the Taliban, and Al-Qaeda, do not represent all Americans, all Christians, or all Muslims. Just like Timothy McVeigh and Terry Jones do not even come close to speaking for either all Christians or all Americans, the Taliban and Al-Qaeda do not come close to representing all of the Middle East or all Muslims.
So, hey, you want to be stupid, go ahead. The rest of us aren't interested in inciting more hatred.