Ok, for the statisticians here are the numbers. There not mine, so don't shoot the messenger:
To put things into perspective, the theory for intelligent life is based on there being over 150,000,000,000,000,000,000,000 stars in the universe, this is an estimate based on the visible amount of stars, galaxies etc which seems to go up every year as we discover more with our telescopes etc. Granted that the conditions for life are small for each galaxy, however, when you multiply that very small number by such a vast number as 150,000 Blllion Billion, the number is vastly in favour of inteligent life existing in some numbers . I think the estimate is 50 intelligent races per galaxy (with each galaxy containing 300,000,000,000 stars , so 50 is a pretty small figure). There are 500,000,000,000 galaxies in the universe. So the estimate for the universe is 25,000,000,000,000 intelligent races. But this is either nor here or there, my point was ( as per the title of the thread) , why are we looking for intelligent life when.
a) It exists in such numbers that they surely have discovered us, not necessarily traveled to us, but discovered us, and yet dont want to contact us . Think about how far advanced our science will be in 1000 years , we probably would have discovered every exo planet in the universe by then. I seriously doubt communication would still be using electromagnetic waves. Who knows what sort of quantum fluctuation crap they will be using by then, so these arguments about searching for light speed electomagnetic waves dont make any sense. Surely in a 1000 years we will be using something else. So why do we look for electromagnetic/radio waves when these are surely not likely to be the communication most advanced races would use. Its narrow minded based on what we know now .