As to the burden of proof there is an anomaly in A15 pix. It has upper structure and strong suggestion of left right symmetry. Controversial A20 pixs from an unknown source show it to be something other than a natural formation. This is evidence.

To claim the evidence is not valid does put the burden on that claim. To refute evidence requires showing better evidence. Just because the majority of opinion goes against the evidence does not make it evaporate. I have not seen irrefutable better evidence yet. Would like to. Strong and well educated opinion is not physical evidence.