US did fund the Taliban that's true. US has done plenty of meddling in external politics.
I wouldn't compare Hong Kong citizens to the Taliban though. They are not an insurgency group. Hong Kong, as I understand, and I'm no expert, by any standard culturally and historically separate from China. Anybody aiding Hong Kong is effectively not aiding an insurgency group inside China but an independent state being overtaken by a neighboring and a culturally loosely-related country.
The US funded the Taliban because they opposed the Afghan government, not because they wanted to help Afghanistan. Similarly, they're never going to help Hong Kong, but only specific groups who oppose the government. (The "culturally loosely-related country" supporting the Afghan government at the time was the Soviet Union.)
