As for this specific situation: The Taliban didn't control the country until very recently. Thousands of people have been at the airport, waiting for planes - you may have seen pictures of them crowding the airstrip. The Taliban has not been preventing them from flying out, the lack of planes and lack of letting them on the planes has been preventing them. People have been applying for visas for months, in public, and not getting them. Some of these people have been waiting for years. There is no universe in which any of what you just said is a valid reason for letting everything turn into a dumpster fire in the first place, and there is no way to excuse the existence of this dumpster fire by praising how well they're handling the massive dumpster fire they created.
No, its not; immigration control is a power Constitutionally assigned to Congress and which Congress has extensively prescribed rules on. Courts have repeatedly in recent years invalidated executive immigration actions as violation of legislative rules, both substantive and procedural.
Easy. Don't let the country fall into the hands of the Taliban before getting people out. That would prevent negotiations with some of the worst people in the world.
This is the depths to which American credibility has sunk. We have to convince them because we have left ourselves no options[1]. Except that they have no interest in being "convinced", but every interest in demonstrating to friend and foe alike that the U.S. has capitulated[2].
[1]: https://news.ycombinator.com/item?id=28224405
[2]: https://www.dailymail.co.uk/news/article-9922849/Biden-tells...
This is fantasy. Even if you could get divided government on board, how are you going to convince the Taliban to let them out? If you think it should have been done in "secret" beforehand, please explain how you get literally thousands of people, many in visible positions, out without being noticed.
This is just one example of a demand for something that could not happen.
They've evac'ed over 100K people so far. It is the largest such operation in history, and it is actually going relatively well.
It is amusing, but not surprising, to see all the 'savvy' media consumers here get rolled.