Honestly anyone who says there is not life somewhere else is just incompetent. The universe if so vast that it would be impossible for there not to be at least ONE other life-sustaining planet. While even if we were the most technologically advanced race (I know we aren't), there must be some form of life somewhere. It might be some single-celled little organism we have never come across, but there is life out there. If there can be one inhabitable planet, there will be more.