I am certainly sure there are aliens out there, but,we just don't see them.
If you are to ask me "why?" in a snap, I would say of course. Because, we can't be the only one in the almighty,vast,unknown place called "Space" and also, here is a link which may perk your interest:
http://en.wikipedia.org/wiki/Wow!_signal
This is the "Wow!" signal.
More info in the link.
again, I am very sure there are unidentified beings out "there". Because,like I said, we are but a tiny speck in the ever so expanding space.
I did a lot of bleep-blooping(researching) on aliens when I was a little filly.
Aliens was always one of my favorite topic to talk about.
And here is a little "joke" fact:
Actually "Dubstep" are messages from aliens. But instead, we are dancing to them.