I think I get it now.
The fact that there is no evidence available for forced landings of alien craft proves that there have been forced landings of alien craft.
This is like a replay of 'The election was stolen; we know this because we have no evidence'.
The fact that there is no evidence available for forced landings of alien craft proves that there have been forced landings of alien craft.
This is like a replay of 'The election was stolen; we know this because we have no evidence'.