Even so, it is estimated that as many as 65% of Turkish women cover their heads with a scarf.

Actually, most of women who wear scarf do this, because it's a custom head-wear in Anatolia; and the traditional headscarf that they wear has nothing to do with the religious "hijab" or something like that. They wear it in the way like the French women weared hats in the last century. The majority of those "headscarves" even do not cover the hair tightly; they have no religious meanings or significance - just custom and local preferences.

Around 15 or 17 of women wear those headscarves that became a symbol of the fundamentalists.

Plus, to add more, the same is applicable in India/Pakistan where majority of women (regardless of religion) wear those traditional veils which should not be considered full blown covers by any means. I'm specifically talking in Pakistan, those see-through or plain simple cloth (google image search) they wear to cover their hair or what not, and in India, they wear sari which could also come under this category.

There is a lot of confusion over what is cultural and what is religious. I think there shouldn't be any confusion over religious restrictions, but that's just me

You are both right, hijab has become just a custom. Like wearing miniskirts was in the West. Its sad. And it is the sheep mentality i think.