Many people who answered the Fermi Paradox assumed that any alien capable of Contact would want Contact.  But some theorized that they simply chose not to talk to us.  To my mind, this is the most probable theory.  The Peloran do not talk about it, but when they made Contact it was via radio transmissions using our frequencies and encryptions, in perfect, if slightly old fashioned, English, suggesting that they had been watching us for some time.