I am convinced that a large number of the conspiracy theories on the go at the moment are valid.The problem arises in ascertaining which ones are for real and which are fantasies built on the very shakiest of foundations. They always sell well!
Here is one which is looking good which suggests - not for the first time - that General George Patton was assassinated for objecting to the way western leaders kowtowed so disastrously to Stalin at Yalta.
The knock on effects of their capitulation damaged Europe for many decades.
If Patton had been listened to, Soviet influence would have been drastically reduced.
It is also interesting that the aftermath of World War Two saw the great man portrayed as politically naive and the possible causer of war with the USSR.
That propaganda alone makes this scenario quite likely.
