The idea that another species of sentient life could evolve and rise up at the same time as us, in a different galaxy, seems highly improbable. Add to the fact that they would be at around the same level technologically as us stretches it to the impossible.
A theory I've heard is that these "aliens" are from the Earth. They developed self awareness long before us, and have had thousands of years to improve their technology, so much so that they can choose to be hidden from humans indefinitely. They are a different species altogether, but have reached sentience and see us as a mild curiosity, the way a person would pick up an insect to see how it behaves. Except they seem to like picking up farmers or lone drivers on highways, then anal probe them.
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