YouSir
Retired from Urban
The US embassy is on the edge of the city in a high security zone full of embassies. You could attack it without affecting local people very much. They try not to live next to the zone because there've been so many battles and bombs there.
Maybe so, but the US would have to react with force to save face. If the Taliban find themselves in de facto control of enough stuff they'd be idiotic to bait the US into getting involved again. Not to say they aren't idiotic though.