Scary theory about aliens (pt 2)

The universe has existed for billions of years. Human life has existed of an infinitesimally small fraction of that time. We have physically only made it to our own moon. Our probes have only recently left our solar system. There is supposedly another planet in our own solar system that we have yet to actually locate and identify. Despite all of the probes and telescopes and everything. 
What if intelligent life stopped by our planet before life could exist here and wrote it off and moved on. We do the same thing when we find planets that don’t fir our definition of “life supporting planets”. 
The idea that we would have discovered advanced extra terrestrial life in the brief 100 or so years we’ve actually been looking is absurdly arrogant. And assumes that advanced life would want to be found by a species that still commits genocide against it’s own and poisons it’s own environment. We are the equivalent of an animal that wallows in it’s shit and eats it’s young. Why would they want to let us find them?