I think, based on conversations I have with people in real life and read online, that the people in the US haven't challenged the 60 years of propaganda about Cuba, and believe it a totalitarian nightmare dictatorship.
I have a close friend who went to Cuba for ecological research (did you know they still have intact reefs) a few years ago, and when they would tell people they were going to Cuba, the most common reaction was a fearful "that's scary" and a confused, almost accusatory "why".
I don't think they realize that everyone else can just go to Cuba, it's only the blue US passport and a bunch of old white guys, and probably now more Cuban Americans, with their fear of communism and land reform stopping them from enjoying a very nice bottle of state owned rum and an experience of how other people live.
I'm glad other countries have been stepping up to help the people there, the Cuban people deserve happy and comfortable lives, and we clearly don't have the appetite to stop starving them of that right now. Until we shake that propagandized view, I don't imagine that will change either.
I'll never forget ordering a salad at the only place open late in the off season in the south of France (they served "american" food) and receiving the most delicious plate of chopped greens and vegetables I've ever had. It wasn't even my first meal in France. I don't think it would have been special to a local, it just tasted like food, not like the tasteless papery stuff I was used to.
Raw ingredients are just awful in the US, unless you shop directly from farmers, and every place you might eat out is supplied by the same very low quality company. Its honestly a bit of a nightmare and I think most people just don't know or try not to think about it.