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Also, why do cosmologists think that another civilization would emit infrared light waves?

Another question is how long does infrared travel in space before it is absorbed by interstellar dust? Eventually it would get absorbed and re-emitted, which would "fog up" the ability to see the real source.

I was going to ask the same, but not knowing how far each part of the light spectrum travels, decided not. However, we do know the visible part of the spectrum shows a large view of the countless galaxies via Hubble. Of course we're looking at billions of years ago according to the speed of light.

Also, what if so-called "dark matter" or "anti-matter" interrupts or degrades certain parts of the light spectrum? How far do UV photons travel in our current knowledge? The questions go on and on and I don't think physics equations are the end all for the answers.

To answer a question about are we alone in the Universe in the movie Contact, the father said, "If so, what a huge waste of space". Personally, I believe something created the Singularity for the Big Bang just because. It could have its own reasons. It could even be a child playing marbles as in Men In Black.