Travel advisories though fact based can be political weapons. This TA has teeth in it as Turkey has a huge tourism industry.
In my opinion PDJT has just given Erdogan the finger.
Or am I wrong and we should regard Turkey as the least of the three evils in the region?
Actually, there is not much difference between Iran and Turkey right now.
Turkey is NATO or this would be different.
But yes, I think this is like you suggested, an in your face to Erdogan by the US. Particularly PDJT.
Assad and Russia are bad enough, but Turkey and Iran are both serious trouble.
For the US Turkey is probably the biggest problem we have in the Middle East right now. The other bad guys know what to expect from US and aren’t saying much.