I agree with you conspiracy theory can mean pretty much anything for example during WW2 people couldn't grasp that Nazi regime had extermination camps until Allies entered East Europe and Germany and filmed the horrors of those camps. Some people could've called extermination camps conspiracy theory and regard it as propaganda against Hitler and Nazi Germany.
>>mrkram+(OP)
When entering the camps, they made sure to document well, because they knew no one could possibly believe the extent of the atrocities without seeing themselves.