Another thing to consider.
I'm not trying to argue if other intellingent life from another star has visited us, I dont know. I keep an open mind, and am not going to scoff at people for saying they have, but..
If you think about it. An alien civilazation finds life on another planet. Intelligent life. Who's going to be sent up to check things out? Scientists in many various fields. Scientists that (This is pure speculation of course) are funded (once again, using or monetary structure as a model) through a government. They would tend to be on the reserved side.
I'm sure that they would be smart enought to realize that they would disturb our way of life if they dropped in for a beer or a friendly hello.
Its alot diffrent than getting a new neighbor and going over to introduce yourself.
I'm sure they would know that religons may tople and crumble, governments would panic. Perhaps they would know that the human race isnt quite ready yet for any such news.
Plus I'm sure the information they'd get from just watching us, and observing us would be far great enough a reward for traveling such a distance.
And we only cover radio radio waves in our search for life outside of our own solar system. And we can cover only a small fraction at that. Plus on a planet that is already littered with radio traffic.
SETI has recieved a signal in the early 70's (I forgot the exact year and date) thats origin was not found. It has long since been forgotten because of its short duration and lack of repition.
We are searching for intelligent life outside of our system about as hard as we are looking for asteriods that are earth bound. To give you an idea of what I mean. We could be hit tommorrow with a 9 mile asteroid, and would of never seen it coming.
As for finding bacterial life, we might have a ringer in our own solar system. Two of them. And no, not Mars. Jupiters moon Europa, and Saturns moon Titan.
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