Yes, the resistance is because the private sector will lose a lot of (parasitic) jobs. It's a non-starter to attempt to reduce health insurance companies power, because it would gut their employee numbers.

It's an unsavory thought, but the US has a significant amount of people employed in the business of denying healthcare to other people, which amounts to hundreds of thousands of jobs.

Any politician attempting to fix this would be committing political suicide.

I think they mean it's an increase in government spending, which would of course be true even if overall healthcare overhead spending is reduced.

We do not have an established history of accurately predicting or managing the costs of overwhelmingly expensive government programs, at least here in the US.