I think intelligent life could exist elsewhere, just likely radically different from humans. It's not that big a stretch when you think about how many stars and planets might be out there.

Who knows, they might be that intelligent they stay away from us knowing full well how violent and destructive humanity can be at times. We kill more of ourselves than many other things do combined, and that probably wouldn't go across too well. Chances are though as because life seems to need a specific environment and even then it needs several other things to happen to force development along, if there is intelligent life out there, it probably isn't all too close. Though it might be *shrugs*. I'm only speculating and that's as useless as anyone else's.