Seems like it has a fine culture with good people in it. Sadly, interference from the outside world and theocracy has made the place a sh*tshow for the moment. And as others have already said, the disunity of many Afghani tribes would have probably caused problems regardless, but it wouldn't be as bad.
1: I don’t really think you would talk about tribes in the context of Afghanistan.
2: I don’t really see what people find so great about Afghanistan or Afghan culture. They’re mostly known for being brave and vicious fighters, treating women as subhumans and pedofilia.