Well, I'd see Hamilton's error in Valencia to be pretty much equivalent to Alonso's start in China in terms of how much of a brainfade the driver has to be for it to happen. The points consequences were very different, but I would say that is more down to circumstances than the drivers.
Its quite funny how you include every mistake which didnt even cost a single position for driver, like for example Valencia and Spa for Hamilton. You can make an endless list of mistakes for almost any driver in that way, but whats the point? Alonso has throw away much more points than anybody else by his mistakes this season, twisting things and nit picking every wheel spin from other drivers in cases where they didnt lose anything because their "mistake" isnt going to make Alonso look better.
I think "nit picking" is an unfair description too. For example, Alonso's Turkey Q2 is included as an error for me as is Hamilton's Australia Q2. Webber's DNF through collision with Kova is included as is Alonso's DNF in Spa. The range of errors is pretty similar for each driver IMO, with the exception of Button.