Originally Posted by Captain Tom Coughlin
there is also #3, that by the time a civilization is advanced enough to develop FTL, that they either are able to study a civililazation like ours without being detected, or that they are so far beyond us that we don't interest them in the slightest.
Yeah, I tend to overlook that one on the grounds that as our civilization has advanced, we have tended to become more and more curious. This is pure speculation on my part, but I have to think that mentalities capable of solving interstellar engineering problems could only get that way by being intensely inquisitive. Therefore inquisitiveness and interstellar flight capability are likely to be correlated.
Therefore it is logical that I go camp out in my lawn tonight, 'cause they are gonna be here any minute now...