A lot of bans are permanent. The word is used inclusively. At the moment you are banning someone, you may not especially care to reassure them it will only be temporary. You may not even have decided if it’s temporary or not. And anyway bans can be lifted. There is no hard requirement of permanence in that word. So no, it doesn’t bother me as it seems to bother you.
2 only works with countries that have something to lose. Don’t assume that a deterrence strategy that works with other major powers is going to work with some small, hellish Islamist dictatorship.