I don't think there are good or bad in exploring the universe. It costs us a lot, not only money and time, many people have died in exploring of the unknown universe. It is danger and expensive to sending human into the space. And we do not get a guarantee that we will find anything.
But why people still explore the space. It is not just only to fullfill our curiosity, but also the wondering why, and how we are here. We want to know the formation of the world, where does it come from? where is our origin?
As we explore the unknown space, we need to think and design the way to do so, so there are rockets, space shuttles, satellites and telescopes. These benefit our daily life, like the cheap long distance call, live TV show from the other sides of the world.