Well who made you the all-seeing arbiter of what serves a purpose and what doesn't?
I live here.
If you want this jackass to burn korans on your street then invite him on your front lawn, have all the other protesters park on your lawn since there is no place to park, and then have at it.
You think you know free speech and all that, this is akin to screaming fire in a crowded theater, no more complicated than that.
You speak of something you no nothing about.
You do know you can’t smoke at a gas station, right? Do some research and understand why the this attempt to incite a riot was forestalled in the area that was attempted to be exploited, it will all make sense to you then.