HDBs are high quality and safe. I don’t think most Americans would object to owning their own apartment if the builder and operator happened to be a government agency.
I suspect plenty of Americans would object just to the "apartment" bit! A successful housing solution for Singapore's situation but one that's a million miles from the suburban American Dream.
The safety of HDBs, apart from reflecting Singapore's low crime rate in general, also reflects Singapore not having the idea that high rise government housing projects are somewhere only the poor and desperate would want to live and their condition a reflection of Singapore not having the belief that government budgets are things to be slashed....
At the very least, the apartments would have to be quite large, closer to a house in floor area, for Americans to accept them. Few Americans would be willing to raise 2 children in an apartment less than 200 m^2.
A significant fraction of Americans would object explicitly on that point, yeah. Wouldn't matter if the apartments had solid gold toilets.
Neoconservatism is a hell of a drug.
Wouldn't matter for the areas that could actually use more housing (dense urban ares), but there is an extremely strong anti-government streak in the U.S.