If the question is why don't we live in space.
In my opinion, its because the media makes the general population focus on stupid things like "celebrities" "gossip" and all the worthless shit. Years ago we were so curious about space, now we don't even give a shit. We could accomplish alot if we gave space programs more funding. If the population doesn't give a shit, the government sure as hell wont either.
Hopefully in the future, the private sector will change things, and space will be commercialized (for example, some minerals on earth become so sparse that we will have to mine asteroids/planets). If we want to really expand into space, we can not rely on the government, we gotta do it our selves. In order to survive as a species, we must expand, and at least colonize the solar system.
Meh that just what i think.
because living in space is harmful to the body. your bones deteriorate and muscles become weaker.
Simple, just make a centrifugal force to simulate earth gravity, problem solved (except for radiation).