What evidence? we don't have enough data to draw conclusions on this matter, we barely sent a very limited robot on mars and some probes in the solar system, the universe is huge.
We can't initiate contact because of primitive technology, we barely made it to the moon with huge costs.
Why aren't advanced civilizations that can reach us contact us? we don't know, there are many theories
Exactly, believing in God has about the same scientific support. I wonder how many people don't believe in God but do believe there is advanced, intelligent life that choose not to contact us and how they reconcile that set of beliefs.
I think it's quite the opposite, believing we are alone in the universe just because we don't have the capability to explore and detect life for me it looks the same as the belief people had a few hundred years ago that the sun orbits around the earth and we are the center of the universe.
We can't initiate contact because of primitive technology, we barely made it to the moon with huge costs.
Why aren't advanced civilizations that can reach us contact us? we don't know, there are many theories
http://en.wikipedia.org/wiki/Fermi_paradox#Explaining_the_pa... http://en.wikipedia.org/wiki/Zoo_hypothesis