It doesn't matter whether or not there is other life out there. Our job is to get out there and explore and exploit resources to the best of our abilities.
If there is any other life out there, we will have to cross that bridge whwen we find it.
I have said much the same thing many times. Sometimes I add that the goal of NASA should not be the Search for Life, and I add that because the Search for Life is often at the top of the list of NASA's justifications for a given space project.