How much time should pass before it's no longer seen as America's fault ? Assuming you're referring to the arming of the mujaheddin.
Instead of talking about what ifs, why don’t you have a look at what has been. Pre-Soviet Afghanistan is truely worlds apart from anything you’d now connect with living in Afghanistan. If you so desperately want the afghans to be at fault for their demise, how did that happen?
Close relatives of mine try to reform and expand Kandahar university clinic and med school, they all have built a comfortable living abroad, they owe that to no one. Of course, there are more than enough elements in Afghanistan that have contributed to their collective fate, profited and now hinder progress. I’m not here to defend them, i despise them. But that’s nothing different to any other country, they just have wayyy more destruction and suffering to foster and grow. Germany just needed a few decades of, in comparison laughable, economic mismanagement, for new politicians talking about gas chambers[0] to emerge. Let’s not act like that’s a uniquely afghan reaction to misery of any sort. Still horrible from all perspectives, no denying that.
[0] https://www.welt.de/politik/deutschland/article206589067/AfD...
I’ll refrain from judging your viewpoint, but I don’t think it’s controversial to interpret this as trying to judge cultures objectively, no? That inherently includes a lot of trust in one’s viewpoint and knowledge to judge off of. Just the snippet you posted here does not inspire a lot of confidence.
Being unable to discern between the product of a society and the situation after an exogenous power funded and armed the outer most fringe of deplorable religious extremism, under the delusion they would be fighting the commies and noone else, is not the good look you think it is.
But hey, I’m sure you regard your own opinion as something valuable and positive, it’s your own after all ;)
[0] https://en.m.wikipedia.org/wiki/Compulsory_sterilisation_in_...