I hear this a lot, but what would beating the Taliban involve? While the US was there, the Taliban was at best in hiding, it was not holding territory. If you mean removing the very idea of the Taliban from the world? That is both hard to do and arguably also a genocide, at least a cultural one. The US has been good at that, but it's also frowned on in the current world - see Gaza headlines.

This is also why I'd suggest it's kind of impossible to both not be the worst of the colonialist systems and stop terrorism (and it's kind of unclear that even the colonial cultural suppression / conversion / excesses / crimes actually would stop terrorism).