Some people believe that we are the descendants of aliens. That would explain a lot too.

Personally speaking, if I was an ultra-intelligent alien investigating this little planet in the back of nowhere with its primitive & warlike occupants I would advise all my fellow ultra-intelligent aliens to give it wide berth.

Who says that we are so bad?  Maybe the other beings oout there are far more violent or just as violent.  Any maybe there are 'paradise' places out.  Who knows? 

I don't and always end up driving myself crazy considering everything...it frustrates me so I just end up forgetting it all.

Who says they are more advanced? Perhaps we haven't exchanged radio signals because they haven't been at the radio age yet.

And really, they only way we could be more violent is all-out nuke war, and it is doubtful any sane species would use nuke.

  My biggest fear about finding life in space is that we'll bring back some alien microbe that our immune system has no defence against, and that it will spread across the Earth, leaving a dead planet in its wake.

Well, it is kind of scary when it comes to an alien disease that we can't prevent or stop.

But remember, no matter how strong a plague is, there will always be survivors. Those who survive are obviously immune. It is then a matter of time to find out what caused the immunity.

Look at the Black Plague back in the renaissance. Europe was almost wiped out of human life, but there were survivors.

Also remember. The human body has the ability to adapt.

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If not insane just plain stupid. This is about the craziest thing I can imagine doing without actually starting a nuclear war. An erupting volcano can affect the weather patterns for years. There is no way of knowing what the long-term effects will be.

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You can bet your boots that some scientist somewhere would bottle it for use as a potential weapon.

You might have noticed that I don't have much faith in the Human race. We don't have to worry about aliens. We will end up destroying our own planet ourselves. It's only a matter of time

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I won't argue with that. LOL

Socrates had said: "I know that I know nothing". This is where we stand and it is a beggining at least.

Our technology is just a joke if we talk about universe exploration. Even if space ships travelled with the speed of light it would take years to travel to the nearest stars. Only aquirung technology based on the space curvature would have an effect but noone is sure this can be done.

On the other hand signal transmitions althoug faster the space ships have similar limitations. Signals from other civilizations to earth? Why? If they can send signals to us they must be much more advanced and then why they should bother. Would you try to contact a fly? I don't thing so unless you had bad plans but this is mostly like an X-files scenario.
Remember that a lot of "noise" is received from radio-telescopes and is called noise because "it does not follow a logic pattern". But are we sure that we understand all logic?