I don't think there are UFO's as you are thinking of them.After all thinkng of the resources required to just get to the moon or to Mars and think what it would take to get from this star system to the nearest star system to us.Who's got the time?Who would waste the resources?And yes if they have FTL travel because they are so superior to us why would they come unless they want something.Possibly some of our resources to get home again.
I don't see us ever leaving our own star system personally.
