What I dislike about 'we are alone in the universe' arguments is that they usually have some motive behind them.
Arguments like this have emotional undertones; one hopes there is life- the other fears this is true.

I am of course biased because I hope to find life out there. I think the fundies fear the discovery of life, or an ETI if we are lucky, could cause a major re-thinking of the Abrahamic religions among followers (And possibly some others)

We all have some personal vision of the universe as we would like it, and the question of ET life hasn't been settled, allowing us to speculate on our 'ideal universe' in that sense.

__________________
Happiness is the Earth in your rear view mirror.