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From X, which is the assertion, is not yet disproved. Therefore, X.
This is a Fallacy. If X is unproven, then it is unproven and remains unproven until reason and evidence is provided or secured to establish the proof or high probability of the claim being true..
Examples:
(1)Of course God exists. Has anyone ever proven otherwise?
(2)Of course pink elephants inhabit Mars. We don't see them because they blend in. Can you prove otherwise?
(3) Of course Santa Claus exists. No one has ever proved, to my knowledge, that Santa Claus does not exist. And if one were to fly to the North Pole and say: Well, look, there's no toy factory there. A believer could argue: Well, Santa Claus knew you were coming and moved his operations to the South Pole. So you fly down to the South Pole. No Santa Claus factory, toy factory there. So the believer would say: Oh, he moved it back up to the North Pole.
(4) Of course leprechauns exist. Has anyone ever proven otherwise?
(5) Of course ghosts exist. Has anyone ever proven otherwise?
(6) Of course yellow polka dotted aliens exist. Has anyone ever proven otherwise?
(7) Of course X exist. Has anyone ever proven otherwise?
...
Example:
- Premise: If yellow monkeys in the jungle J exist, then you will observe the yellow monkeys in jungle J
- Premise: No observation of yellow monkeys in the jungle J occurs
- Conclusion : There are no yellow monkeys in the jungle J
This would be a VALID argument pattern so if the premises are true the conclusion would be proven to be true. HOWEVER, those who want to hold to the existence of yellow monkeys in the jungle J will introduce auxiliary claims so that the failure to obverse O does not disprove the existence of yellow monkeys in the jungle J..
...
There is the mistake of thinking that there are only two alternatives of a false dilemma:
Premise 1:Either X exists or X does not Exist
Premise 2:You cannot prove that X does not exist
Conclusion: X does exist.
OR
Premise 1:Either X exists or X does not Exist
Premise 2:You cannot prove that X does exist
Conclusion: X does not exist."
http://www.qcc.cuny.edu/SocialScien...ER_5_ARGUMENTS_EXPERIENCE/Burden-of-Proof.htm