He-3 is preferable for a fusion fuel since it's aneutronic--no radiation to deal. It comes that way from the moon, the path to producing it on earth does everything but avoid radiation.
Even the "aneutronic" fusion reactions have side-reactions that produce neutrons [wikipedia.org]. While a lower neutron flux helps with materials engineering from a longevity standpoint, it still makes the reactor wall materials radioactive. That's the real problem, and He-3 doesn't fix it.
He-3 is useful as an advanced fuel in rocket propulsion
a) Requires technology that is currently at the wishful-thinking stage of development.
b) Rockets don't require aneutronic fusion, because fusion engines would be most useful in deep space, where radiation is not a problem.
c) He-3 fusion isn't entirely aneutronic anyway.
d) He-3 fusion is harder than D-T fusion.
Power can be produced in space and beamed down to earth
Has nothing to do with the Moon, or an orbital tether.
There is no realistic source of power that either exists only on the Moon, or would be cheaper to produce on the Moon.
Many of those rocks we have down here on Earth resulted from really big rocks from space slamming into us. Might be good idea if we have technology, infrastructure and humanity already in space before we're in need of it.
A tether on the Moon won't help you solve this problem. If this comes up, robotic space-probe technology will be all we need, and we have that already. Stop watching Hollywood sci-fi where brave men have to go deal with the problem in a giant space ship. The real solution will likely be as simple as coating one side of the incoming object with soot.
Putting multi-trillions of dollars into the vacuum is preferable to craters into the middle-eastern sand. The same jobs are created but at the end of the day at you have something far more impressive to show for it and far fewer lives expended.
[citation needed]
Things aren't that simple in the real world. As cold and sad as it is, the lives of brown people in a distant desert just aren't worth much to anybody in the United States, unlike the oil they live on top of. By some calculation it was worth it to invade. Thanks to various mistakes, the cost ended up spiralling out of control, but even so the wars are probably a better investment than going to the Moon.
He-3 is worthless, because it doesn't achieve aneutronic fusion, just slightly-less-neutronic fusion. So then, what's left on the Moon that's worth a multi-trillion investment?
Seriously, name one thing that's on the moon that you think is worth trillions of dollars, keeping in mind that its surface is entirely covered in rocks.
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