And realizes that we should fear contact with other life in the Universe.
We only have to look at ourselves to see how intelligent life might develop into something we wouldn’t want to meet. I imagine they might exist in massive ships, having used up all the resources from their home planet. Such advanced aliens would perhaps become nomads, looking to conquer and colonise whatever planets they can reach.
I don’t know about the Nomad concept but I do know that it is in the rational self-interest of any intelligent life that meets humans to destroy us. If for no other reason than simply because there exists a non-trivial probability that we will attempt to destroy them, whether through fear, misunderstanding or our own rational self-interest.
Thus, the best shot we have is to shut down any attempts to contact extraterrestrials and shut them down now! No contact is the best contact.
Update: Adam got there first and as usual, funnier. But my point stands.