USA had that ability some 50 years ago. Since then companies changed, technologies were replaced, knowledge transformed and people got interested with other things, not to mention that risk threshold grew a lot. As a result, right now USA can't fly men to the Moon.
US government, however, doesn't want to give China the ability to say "yes, we're on the Moon - and we're the only nation which can do it today". And because of that, we have a rather similar conditions today as we had some 60 years ago - US government can't really allow China to fly men to the Moon without showing that Americans are also doing that, at the very same time.
Taxpayers, of course, are and were different - somebody doesn't care, somebody else cares a lot. I doubt US government want to assume those who care aren't that important.
Today we are not at war, at least not one that concerns space or the Moon. China is in a fierce self-imposed race to land on the Moon and Do The Other Things because it (probably correctly) views the West as an enemy to overcome. The US has not reciprocated that sentient, we've just shut them out of our space programs and then left them be.
For the US government to fund another Moon program we definitely need an answer to the question of Why. So far we don't have one other than THE PRESTIGE and OUR SCIENCE GRANTS as evidenced by many other threads on similar subject matter here. That's not going to convince the taxpayers.