Right, because as thinking, considerate adult humans we couldn't possibly put two and two together and realize that somebody else with a Model S might be driving through and need to charge, and it would be kind and thoughtful of us not to block their access to the Supercharger, using it as our own personal parking spot. Instead it's Tesla's fault. Doesn't anyone ever get tired of blaming others for their own self-centered, selfish, inconsiderate, BS? I plan on cutting someone off on my way to work today when getting on my exit ramp and I'm going to blame the county for it for not making the exit ramp a 1/2 mile longer.
The fact of the matter is that Tesla could put a big, flashing, neon sign at all Superchargers stating the spots are for charging only and limited to 20 minutes and all sorts of people would continue to use them as parking spots - and you know it. Put the blame where it belongs.