Most people I meet and myself included feel that if life can exist, then it will. If you have a planet where life could potentially exist and it's been like that for a billion of years, that could give life a lot of chances to get going. If you think of it in terms of statistics and use a little imagination, you could come to the conclusion that absence of life on an earthlike planet is much less likely than the presence of life.
As for aliens, I'm just not sure how even smart ones would get here. I'm not saying it's impossible, but let's face it .. they might be very far away. Maybe despite possible advances in technology, space travel over immense distances still won't be feasible.
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