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It could be explained psychologically.
Physicists for some reason seem to believe that to show that some kind of phenomenon
exists, you need to observe evidence.
Respected mathematician N. Wildberger argues very convincingly that such
a thing as evidence is not needed at all, at least not in mathematics.
Wildberger confidently announced a proof of the famous Goldbach conjecture,
despite the fact that no evidence of a such a proof had as yet been observed anywhere at all.
Wildberger also insists that ordinary arithmetic contains a contradiction,
despite the fact that no evidence of such a thing has ever been seen in
the observable universe.
The discipline of Theoretical Physics simply has to catch up with the real world.