Yes, but with caveats.
Culturally, though, it’s because that over half of the population doesn’t know that they would benefit from trains? In the same way outside (just as inside) the US there’s an age-old divide between farmers and city folk (see Denmark or France for the most recent protests).
In China, >66% of the population lives in urban areas. In the US, <30% live in proper urban areas (a vast majority, 60%, live in historically car-centric suburban areas mostly developed post WWII).
The issue is not that those areas that would benefit the most don’t support it, it’s that the areas that would benefit the most from it are surrounded by areas that currently have no viable alternatives (and thus knowledge that something else is possible) other than a car. They’re already driving >1hr to get to work or an airport. Therefore, of course they think anything that takes away resources from wider roads is a waste of their own time and tax money, as it does not benefit them.
The reason the California HSR, if ever finished, will actually mark a cultural shift is that it’s the only megaproject attempted since the 21st century that actually puts modern alternatives to the car in rural areas: vast amounts of money could’ve been saved by connecting LA to SF and SD by electrifying and tunneling on the current Amtrak route, but that would’ve left out about half the state.
Was it too ambitious? Maybe. But in 50 years, maybe everyone will be talking about how it changed California, and the US’s, entire attitude toward rail.