Not the Taliban’s fault. Not the Afghan government/military. Not previous US administrations going back decades. No, all Joe Biden.
Perhaps you'll understand with an illustration: You bought an old car that needs much repairs. You are aware of it but take it out on the highway anyways and have a major accident. Who's to blame? The previous owners? The Car itself? No! It will be you! You took an action that, given the circumstances, didn't make any sense.
Same goes with the situation in Afghanistan, the US did a poor job at handing over power to that countries government/military. And than, even worst, they didn't even prepare for proper evacuation. But who was it that actually took the decision to leave like this? It was Bidden. Trump made a lot of promisses that he didn't follow and leaving the Afghanistan was just another one. When faced with the facts, what was more important? Uphold his word? Or was it to ensure that he wasn't serving up on a plate thousands of people to radicals? I never liked Trump, but he never messed up as bad as this.