I'd like to issue the following fatwa: Any driver blocking traffic while waiting for a parking spot to open shall be subjected to a public stoning. If said driver is driving a minivan, BWM, or talking on a cell phone they shall be stoned twice for good measure.

Since that's unlikely to happen I propose a broader and more socially responsible resolution: Tested and certified competent drivers will be issued paint ball guns which will carried at all times. These drivers, upon witnessing an act of driving stupidity, will tag the guilty driver with a barrage of paint ball ammo. A paint splattered vehicle will alert other drivers to the incompetence of the driver so they may react accordingly when dealing with them.