Just a rudimentary understanding of Medicare as it is should inform you that Medicare is a 'buy-in', as is SS.
Contributions throughout a working life are the common threads.
And for Medicare, yes, a premium is deducted from monthly gross SS. So, Medicare for all would need to duplicate a similar buy-in.
A combination of employee payroll withholding and corp. taxes for example.
It would be no more socialistic that money for roads, schools, police and fire depts., DOD, NASA, CDC and so on.
And oh yeah, my favorite hypocrisy bubble prick, no different than the redistribution of tax revenues, collected from higher GDP States, to less prosperous States. You know who they are.
You want to get worked up over makers and takers, you need to face those facts.
And give us our damned TVA and rural electrification back. Also all of those WPA constructed post offices with the nice murals inside.