Because currently the working population pays what is effectively a tax for health insurance. I pay over $450 a month for a family plan, and that's cheap and subsidized AND I need to pay for copays/deductible/coinsurance.

So taxes could go up $5k/yr but if I got health insurance, I'm better off.

The savings would take longer to realize because they come from better contracts, better preventative care, increased screenings etc.

Healthcare Spending in the US is split across private and public expenditure. Under universal healthcare the public would pay more, but net spending would decrease.

idk maybe those savings are not upfront but are more around productivity improvements and so on.