That was a court of law which ruled in that case (and then again for multiple appeals processes), the NHS has no such power.
But it can't be stressed enough that this was about who makes the decisions, not about who pays for care. The money was there to pay for the alternative treatment (fundraised, in this case).
The question was whether the parents have the right to make the final decision, or the courts. And English law is very clear that in the end the High Court has the power to make care decisions in place of the parents when it believes it is acting in the best interests of the child. And that extends to withdrawing care and allowing the child to die.
You may not want judges to have that degree of power. That, honestly, they exercise it extremely carefully may not be a comfort. You may think that the parents' view should always control. That's fine. But that has nothing to do with the NHS and its funding system. The same issues would arise even if the child was in a private hospital and the parents wanted to pursue futile treatment against the advice of the medical staff.
https://www.vox.com/policy-and-politics/2018/4/27/17286168/a...
It does. It is much more legitimized to delegate these kinds of decisions to the state when the state is paying for the health care. In other words, the state paying for care is a pre-requisite to the state having the ability to make these kinds of extreme/overruling decisions about care. Otherwise people wouldn't tolerate it. The state paying for care is a power dynamic.
Consider the opposite, of a state that doesn't pay for any care, telling Alfie Evans parents that they have to take him off of life support, and tell me that you think the social reaction would be the same and people would just accept it. They wouldn't, and that shows you how much the issues are linked. Again, it's a power dynamic that increases legitimacy.
For your "opposite" case, where a court could order removal of a baby from life support, there have been several cases in America
https://www.chron.com/news/houston-texas/article/Baby-dies-a...
"Sun's death marks the first time a U.S. judge has allowed a hospital to discontinue an infant's life-sustaining care against a parent's wishes, according to bioethical experts. A similar case involving a 68-year-old man in a vegetative state at another Houston hospital is before a court now."
My underlying point is the power dynamic between a government and its people, and the argument that a government "providing" more things increases that dynamic in the favor of the government. This makes any decisions related to that dynamic more legitimized.
The US government provides 27% of things in the US (budget vs GDP), about the same as South Korea and Switzerland, more than Ireland (23%), less than New Zealand (32%), UK (33%), Spain (34%), but not by an extreme amount.
This is silly. Budget vs GDP is not how you measure how much a government provides. You're not controlling for waste.
And for what it's worth, these cases are basically never discussed even outside the courts in the UK on the basis of 'can we afford it?', but rather 'is it the right thing to do?'. There are financial constraints on the NHS, particularly on the provision of care for chronic conditions and expensive new drugs with positive but marginal utility, but these kinds of 'right to life' cases are not where it bites.
'Everyone should receive the best care' - so how do you suggest this is best done?
The NHS had no power to stop them, and did not. The courts did because the parents were taking actions that were not supported by medical evidence.
As for the rest of what you're saying, it is also unsupported both by evidence, and by the fact that the UK does have a free market for medical treatment, one that is far cheaper than the US, and for health insurance, that is far cheaper than the US. One might argue it would be paying twice, but the NHS costs about the same per capita as Medicare and Medicaid combined, so Americans pay twice. But the NHS offers universal cover for that price.
UK health insurance is in general cheaper than in the US because there's no demand for comprehensive cover - almost all the cover is "top up" and "queue jumping" type cover that assumes people go to the NHS first and get referred private if they need something that can't be offered quickly enough by the NHS or that isn't covered.
Yet despite the low cost, only about 10% of people in the UK feel a need to obtain private health insurance.
The free market has spoken - for most it does not offer compelling alternatives to the NHS.