[Scarlet Pimpernel]

"What percentage of my earning do you need to keep them happy?"
I am not without sympathy for your position, but I still think you are not seeing the bigger picture.
100% of my earnings would not have been possible without the space program. The space program, as flawed as it was and still is, created far more wealth than it consumed. I would prefer a free country where people are not discouraged by taxation and regulation from investing in space, but either way, space exploration is a bargain.

[Atlas Sneezed]

"The space program, as flawed as it was and still is, created far more wealth than it consumed."

Even accepting that, the free market could have created even more wealth with what was invested. (You don't need to go to the moon to develop teflon and smaller computers).