It's not unreasonable to think Biden shouldn't have pulled out as this horror was expected, but it's also not unreasonable for people to think it's long overdue as the longer we try to solve such a complicated network of systemic issues in Afghanistan, the more we're blurring our own lines of what is acceptable to end this.
There has been some back and forth about whether the US will continue to provide air support to Afghan forces, but in general, I'm not sure how much good further US combative support will do. There are other ways to support or "not turn our backs" than that.
Yes, it's terrible what's going on, but it's also terrible that we're now approaching the 20th anniversary of the US invading Afghanistan, practically a generation of this, with all those lives destroyed, and this is where things are at. The US - and other nations and international organizations - can provide support for the Afghan forces to do more to stop this without sending more of their own to fight or further expansion of drone strikes.
If the UN or others want to step in or increase support, go for it, but I don't think America has the solution for this. Some US work there has been great, that shouldn't be erased. However, some has been horrifying and a whole spectrum in-between. They've recently jailed an intelligence analyst for the release of documents on the US "kill list" (with last I read at least hundreds of thousands if not over a million targets) and civilian deaths in drone strikes that were doctored away as combatants including girls and women maimed and killed.
How many more times does the whistle need to be blown before it would acceptable to call time on American combative intervention? What more can they do that hasn't been done over the last 20 years that could actually last?