Why are we doing things like this? They're a waste of time and money, which could be spent on things like curing HIV and cancer, ending world hunger, or finding a solution to global warming. Spaceflight solves none of these problems and is a complete waste of money. It's also a waste of talent because these scientists could be putting their effort into solving so many more important problems. Why go to space when we need to solve our problems here on Earth? I'll be censored to -1 because this is unpopular with Slashdot users, most of whom don't care about solving the real problems in the world.
It is not a waste of time and money! Spaceflight is a frontier in science and engineering, which is cross pollinated with all other fields of science. From agriculture, environment, communications, astronomy, medicine, meteorology. and so on. Which in turn is about having easy, cheap access to information and education for all humans. Including poor people in remote areas. And tracking and understanding global warming.
And that is only the start. One of Space X's goals is to make access to space real cheap, so that sending up something won't cost 450 million dollars. People seems to have a hard time imagine the opportunities that will arise when launching a rocket will cost 1/100th of the current price. A whole new industry will form. Very small companies, cities, universities will be able to build and operate satellites, even maybe travel up and conduct research in a not too far future.
Solving problems in space means solving problems on earth.The earth is in space after all. If we ignore that we will miss out on endless possibilities and maybe miss serious threats to all of mankind. Including the cures to the problems you mention. If people reasoned like you all the time we would still be stuck in some middle ages like society.
Reality is never simple, and you never know where you will find the next great invention that helps mankind to prosper.
Professional wrestling: ballet for the common man.