Topic: There are no absolute distinctions between what is true and what is false.
Opinion: Some things in the world just cant be proven to be true, but that doesnt meant that they are false.

Support 1:
Just because it cant be proven clearly that aliens dont exist means that they dont exist. it would be extremely arrogant for human beings to think they are alone in the universe. Just as at the same time, someone saying they dont exist is equally right because it still isnt proven. Both sides are right, and one doesnt diminish the other.