> That money came out of someone else's pocket!

This is also true of insurance systems.

Nobody's pretending that socialised systems magic healthcare out of thin air, it's more a question of total resources spent by society and distribution of outcomes - including whether certain people get rationed out of the system because they can't afford it.

Insurance is voluntary--you can opt out. I can't opt out of taxes and put that money to other uses. It is am matter of economic freedom of choice.