The probability of life being anywhere else seems very high to me. I cannot figure out why of such a huge universe... only our planet should be blessed to have intelligent life. That is the main premise for me to question this. One cannot be sceptical about it, though. I guess we still do not have enough means to explore the vastness of the universe. As my favourite quote says:
"I see what is, and ask: why? I dream of what could be, and ask: why not?"
I think we should keep questioning this until we are able to explore the entire universe… that seems light years away.