The main problem here is not the offending video or else, the main problem is there is a monopoly in Turkish internet backbone and youtube users in Turkey use half of the total bandwidth , They dont want to improve their backbone so they are covering their behinds by banning the site with the most traffic. It's not about politics it's about money :) And believe me I know this is my job.
This is utterly ridiculous. But in the same time you have a bit right here. First of all, these blockages are ordered by a law no 5651. They are mostly ordered and applied by judges via isps. Some of the blockages are not based on judge jurisdiction but by government organisation telecommunication and communication precidency. Ridiculous thing is they are full ip based level 3 or level 7 dns-ip diversion blockages. So by blocking a ip blocks they are also blocking "innocent by law" applications or sites. Virtual hosting like same ip different applications are not considered by law or by isp's. (well main isp responsible is Turk Telecom Net cause they have internet monopoly in Turkey). The thing you are right is they have accidentally the whole internet! By blocking google ips. And I do not believe TTnet has this much idiot engineers or admins. They sure have some background agenda by making these "mistakes"