prevention (which national healthcare does) is cheaper than cures (which corporations love because they make more money).
I don't agree that this is always the case in the US. DH and I got a decent reduction ($50 per month each) in our insurance premiums if we had an annual medical check up, including breast check (for me), testicle check (for him!) and thorough blood tests. Neither of us had had a medical like this before we moved the UK, though I understand if we had stayed in the UK at some point we would have been invited to the GP for a "Well Woman" check or a "40+ check".
I can never for the life of me understand why some in the US look at the NHS like it's a bad thing
It's seen a socialist thing which makes it a Very Bad Thing. Also, although I love the NHS and will fight to retain it, it's far from perfect. The ability to ring up my DC's pediatrician and schedule their vaccinations for a time that suits me is amazing, rather than simply be sent a summons to the GP or run the gauntlet of the telephone appointment system to set something up that may or may not be particularly convenient.
Why was Obamacare so unpopular? Well, it didn't help that on (some? all?) payslips there was a separate line detailing how much had been deducted at source to fund it. No tax is going to be popular if you can see each month how much it costs, particularly if you are also paying into a private insurance policy and are unlikely to benefit from Obamacare personally