This is not an easy question to answer. Because in one hand I do believe in aliens. In another hand I don't believe in aliens. How is this possible?
I believe that aliens can exist by using the definition "Can alien life exist on another planet?". But I don't believe in aliens in the manner that the general public does. Here are some questions that most people would answer differently.
1) Have aliens ever visited earth? No. Anyone who says otherwise isn't basing their conclusions on evidence, or practicality but rather on belief. Nothing wrong if you want to be believe in something but that doesn't make it true.
2) Isn't it a terrible waste of space if humans are the only living organisms in all of space? This argument doesn't have much levity in my mind. Saying that is almost like saying someone had a purpose for creating life. To believe that you need to believe in a higher power. Something that I can't do.
The reason I can't deny the possibility of life is because there is actually a lot of space out there. But I don't think aliens will come in the form that is perceived by the public. Very likely we will find some organisms on some planet the meet life in some level. Not the common expectation of an alien with a head, 2 arms, 2 legs and whatever other features make it convenient to live on our planet.
I'm also a little bit surprised on how humans came about. We didn't come about over night (unless you believe in the bible). It took us millions, nay billions of years to come to where we are now. When you think about all the coincidences it takes to create life the odds were against humans from existing in our current form. But some how over time we became an intelligence species that rose above the rest. Could it happen again? I'm not going to hold my breath to find out.
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I'm with you in large part. To me the explanation is that of odds. Odds are, something else out there exists. Some scientists speculate that a planet with lifeforms is likely to exists every 1000 light years or so.
I feel compelled to underline that human existence, intelligence (limited as it is) has very little to do with coincidence or chance. Evolution is not about chance as many creationists claim - it is about natural selection. Traits that are beneficial produce an animal that has a higher chance for survival and offspring, while the less efficient members of the species are less likely to reproduce. The positive genes are passed down. The effect is then multiplied through subsequent generations.
There is a belief that some luck WAS involved in our existence. A crucial ancestor of ours is the Pikaia - perhaps the oldest known ancestor of modern vertebrates. It survived the Cambrian age, at a time when so much else died off. To date, less then a 100 Pikaias have been found (60 is the highest account I can find, and I have no idea how recent the total is).
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