A better question is, "Why would aliens want to reach out to us?" We are a very war like planet. The United States has been at war for all but but about 20 years of its existence. Just as you keep sharp knives away from children, you keep advanced technology away from potential bullies. We have trashed our planet, polluted our atmosphere, half of our world is starving and the other half can't to bothered to do anything about it. What would an advanced civilization look like, hopefully nothing like ours. As for intelligent life out there, I doubt that we would recognize it if we saw it, and if we saw it all we'd want to do is kill it because it would not look and act like us. We can't even get along with people of a different skin color.