They are probably relying on the petrol they are sitting on in northern Iraq and their new uncle Sam who would do anything for a piece of the cake, even support terrorists and it wont be their first time either.
Its no surprise that the PKK attacks, after laying low for so long, have escalated all of a sudden even though the governments of Turkey have come a long way in treating them with more respect and giving them more minority rights including a Kurdish party, so it is not about the rights of the Kurds in Turkey anymore.
Do you think it is a coincidence that all this is happening around the same time when the US is deciding to remove its forces by 2008? These fuckers have to hurry up and pull us in there and make us face the US in order to ruin our relations with them, because the US cannot support both us and them at the same time when they are the ones who keep killing while no ones is looking meanwhile we are forced by the rest of the world to find "non-violent solutions" and some fools are even trying to remove the PKK from the list of world wide recognized terrorist organizations! : /