Exploring space may lead us to get acquainted to other species, and it might as well be a great thing as the end of human civilisation. The various possibilities have been explored left, right and centre by sci-fi writers and filmmakers. While I believe that there is a 100% chance that Earth is not the only inhabited planet, I also believe that such encounters can lead to a happy ending or extinction with a 50-50 chance.
I believe that there must be other inhabited planets because there chances of having similar conditions for evolution on other planets are really high given the increadibly high number of stars and subsequently the possibility of solar systems. Even though chances of a winning lottery ticket is low, there are winners. And this in only if we do not consider some kind of doctoring that resulted in life on earth.
However, given technology's limitations and the distance between Earth and other planets, it is highly unlikely that we will meet life on another planet. We may meet life from another planet as they might also be interested and more technically developed, thus coming to see us.
Regardless of these low chances, I think exploring space has been beneficial for humans. Exploring in conditions that are harsh or extreme has led to several inventions that had wider benefits for people. Exploring space also means that scientists leave their comfort zone with an open mind, again with the potential to know more and to understand more as compared to good old scientific discovery on Earth.
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