I'm not saying to build cities on other planets, that is decades away. I'm simply talking about improving our technology, and it doesn't even matter if government will do it or not. Private companies are already scrambling to get into space and mine the moon, asteroids, mars, and much more.
Fusion power is the future of energy production, to achieve this you need water and helium-3, too bad we don't have much h-3 on Earth and will need to go into space for it.
Also to get to Mars we will need a better fuel source/fast engines, that same technology will be used on Earth.
Space is the future.