Some of it probably is. Just not down the government's toilet. Every one of those issues IS being worked by private enterprise.
It’s always been a joint venture. Before the commercial benefits are clear and the technology is mature, government spearheads the basic research. Once it’s more clear, only then do the relevant private industries come in and run with it.
That’s been true of just about every technological/scientific advance: everything from airplanes (the first place to fund Orville and Wilbur Wright was the US Army), to rockets, satellites, lasers, space exploration, nuclear weapons and energy, DNA and molecular biology, cancer research, solid state physics, superconductors, computers, the internet, etc...
Think about this: right now, one of the frontiers of science is particle physics. That’s where the Higgs boson (aka, “The God Particle”) was found in 2012. This seems to be the basis of how some particles have mass, and others, like light particles, don’t. It’s a huge insight scientifically, and in the future might have some very interesting technological/scientific implications. It was funded by the Dept of Energy in places like FermiLab in Illinois.
But what are those commercial applications? What industries would be interested in investing private R&D dollars into pursuing it? None. That’s because the science behind it has not really been well understood or worked out yet. Once it is, only then will the potential commercial applications become more clear, and private industries will jump in to develop it.
But right now, there is no interest. If government stops funding this, it will remain a black box.
This all or none thinking is really toxic. The world is not that simple.