Turkey is currently weighing what to do militarily about the PKK, the Kurdish rebel group that is either a terrorist organization or an army of freedom fighters. The Kurds, or some number of them at least, want an independent homeland made up of parts of Turkey and Northern Iraq. Turkey and Iraq are less supportive of this idea, and the Turkish parliament has voted to allow their forces to move into Iraq if needed. The US is trying to discourage this because of the potentially destabilizing effect it would have on Iraq (imagine what a destabilized Iraq would look like).
Here’s the thing. The US doesn’t agree with these possible actions, but they are all in line with what the US itself has done in Afghanistan, and in fact are pretty understated compared to the war in Iraq. We can argue with them based on tactics, we can explain that a stable Iraq is worth the risk, we can even bribe them with cash and cheap fighter jets. But we can’t take the moral high ground because we don’t have it; we gave it away 5 years ago.