The US govt makes some strange bedfellows, doesnt it? They are allies of the KLA, who has been on the INTERPOL list of terrorist groups for many years, then miraciously, are taken off of it when they fit the needs of the US agenda.
Your understanding of recent history is faulty. The US never supported the Taliban against the Northern Alliance (though there are some NA people who would say that we didn't do enough for them before 9/11, but that's not the same thing as supporting the Taliban).
In fact, the US had the Taliban on a "terrorist nations" list long before 9/11, and never recognized them as the legitimate government of Afghanistan. (We recognized the Northern Alliance, again long before 9/11.) The Taliban were created and propped up by the Pakistani ISI and Saudi Arabia, not the US.
(I know that comes as a shock to you, because you'd like to blame America for everything, but -- incredibly -- some things are not our fault.)