From what I understand (I am not a UK citizen, but me mum's mum spoke Scouse. My mother, on the other hand, spoke The Queen's English), everyone loves to hate on the NHS, but no politician in their right mind will touch it. It's a "third rail."
In the UK, it's from the voters.
In the US, it's from the Healthcare Industry.
They are allowed to spend as much as they want for votes due to their freedom of speech. Sure they can't directly vote but ever since like 2010 have a lot of human rights and I'm sure would love more. I would not be surprised if one day they could directly vote considering due to their rights. I hope though we can push back before then and change things.
https://www.brennancenter.org/our-work/research-reports/citi...