You continue to ignore the most important point: They shoot you down.
Maybe. I'm not so certain about floating launchpads in the Pacific. But you're missing the point as well. That point is there is no financial gain to be had for private enterprise to send out a Voyager spacecraft.
Well, right now, probably not. But you again suppose that people would be wholly focused on monetary goals if not for the benevolent hand of government... in their wallet. That's not true. Lofty scientific goals would still be achievable, because I, for one, am passionate about space exploration, and I know I'm not alone. If I asked - and there's a key word, asked - I know I'd get the money. The things that government has done that come as a public good are not because of the taxation model, but despite it. When you don't have to ask, you can get a lot of things done that people don't like, too.
It always works out like that, and yet somehow the kind of coercion that actually benefits you is more objectionable than the kind that makes a rich man richer and does nothing for you. I just don't understand that mentality at all.
I don't see any coercion in the employer/employee model. Could you point out where it is?