Oh, no way, "We don't know" is no excuse to put something on the science channel saying aliens did it. Something is not science just because you can't disprove it. The minimum requirement to call something science is that there exists a way for your hypothesis to be either proven or disproven.
This is the blending of information and entertainment for better ratings. Pretty soon the two will be indistinguishable, if they aren't already. (Journalism and propaganda are already indistinguishable)