Beyond our solar system the best data we have are shadows blocking star light that indicate an exoplanet sometimes they are false alarms being just star (sun) spots, radio waves are something we use at this point in our very young civilization, there is no indication that this is a standard or efficient way of communication to associate missing radio data to absence of other civilizations.
In conclusion we have no data about life in the universe to jump to such conclusions or any conclusion, the only thing we can do is continue exploring and speculate on the question if there are advanced civilization capable of contact why aren't they contacting us?
