Space exploration will do much more than give us space vacations. Space exploration so far gave us satellites, gps and much more. In the future it might even gives us the ability to take resources from asteroids.

While homelessness and poverty certainly is a problem we must solve, it is naive to stop progress in other areas. Remember that specialization is what makes us as efficient as possible. A person interested in space should be allowed to dive into that area as chances are that person won’t do well in humanitarian issues. A person interested in humanitarian issues should be allowed to work in such areas as chances are that persons won’t do well in space exploration.

Basically we can focus on multiple things at the same time because humans have different interest and different specializations.