What aliens would say to us if they could
Among the many theories proposed as to why aliens aren't communicating with us, one of the most disturbing is that if they could, what they would say to us is:
"Shut up, you fools!"
We're like a lost fawn bleating in the forest for its mother. We're likely to attract the attention of whatever it is that has everyone else staying quiet and hiding. That's why there has been some criticism of certain experiments attempting to broadcast from earth to other potentially-inhabited star systems. Is it worth taking the chance? Do you want someone else taking that chance on behalf of all of us?