The burden of proof is highly debatable.
.Gov has been running a psychological operations program on this subject for eighty years.
Perhaps you have been a victim of it.
I know a con when I see it. The same videos. The same narrative based on nothing but speculation. This amounts to "I want to believe" even when no proof is given.
Most of the 'new' and 'shocking' video looks like amateur cgi. Nothing in the narration presents proof, only speculation.