I wouldn't burn a koran. Just like I wouldn't burn a christian, jewish, hindu or other religous item. Lumping all muslims in one group is like saying all christians are like the Westboro Baptist idiots.
If the people in this church in Florida really want to show muslims how much they hate them and that they aren't going to take it anymore, give them a rifle and send them to Afganistan to fight. I bet none of them would do that. It was just a publicity stunt.