Are they a danger? Certainly, some are. There will always be dissidents, and some terrorists. The difference is that they will not be in charge of the nation, and able to draw on vast organized infrastructure like training camps and other such things.

And I am sure that many ex-Taliban were just guys trying to get on the right side of things, to get to a place where things like food and privileges could be had, and most important, to not be on the outside where you might get hurt.

Many people through history have done this. In many communist nations, unless you joined the Communist Party, you didn't eat as well.

Of course, the trick is figuring out which is which.