It would be stupid to assuredly believe that there exists no life outside of Earth.
This question could be phrased a lot better. Yes there is certainly life outside of Earth.
When you consider that life on Earth is formed from the most common elements in the Universe it's hard to believe that there isn't life out there.Do you believe in them?
No, considering the sheer vastness of space it's unlikely that alien life would've become aware of our existence in the 70 or so years that we've been putting signals out into the Universe.Do you think they've ever been on earth?
See above.Do you think they're watching us?
Sure but with the caveat that nobody with any political power should be allowed to do so.Do you think humans should reach out to them?