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.