It is neither a theory, nor a hypothesis. It's a test to see just how gullible someone is and how easily misled they are by conspiracy claims that have no evidence, yet there is a seemingly infinite amount of evidence disproving this particular "claim". Honestly, I doubt that most people who push this claim forward actually believe it themselves. While it's impossible to say for certain whether or not someones professed beliefs are something which they actually believe, there are certainly a great deal of people who say things just to be contrarian, or to troll, or even get rich off the minds of the credulous.
"I hate people who blame the Devil for their own shortcomings and I hate people who thank God when things go right."
Voltaire.
Voltaire.