I believe any malevolent supercivilisation would have rapidly self-destructed as we may be in the process of doing ourselves. If we do have contact, physical contact with aliens, I think it will be benign.
Arthur C. ClarkeNo communication technology has ever disappeared, but instead becomes increasingly less important as the technological horizon widens.
Arthur C. ClarkeIf an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong.
Arthur C. Clarke