Source? Everything I've read says the Syrian Turkmen are certainly allies of Turkey, but not assets.
Later that day, Turkish 'officials' in Ankara, confirmed the statements of Esil Nuceyfi about the before and the positively promising future of the training of Turkmens both in Iraq and Syria" https://en.wikipedia.org/wiki/Syrian_Turkmen_Brigades#Brigad... http://www.telegraph.co.uk/news/worldnews/europe/turkey/1201...
I see it like directly comparable to what the US did in most of the significant conflicts ever since the ww2. It didn't say what Osama bin Laden should do (back when he was a "good guy"), but it did give him intel support, training and guns, which is almost the same.
Not saying that the US is unique in this, it's just the most prolific and egregious by far. Turky is just learning from the best.