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I would like to point out that it is also an acceptance of changing reality that could have been a factor in Korach's mistake. Korach challenged Moshe in that he declared that Moshe promised to bring the people to Israel yet the desert generation was now under a Divine edict that they would perish in the desert without entering the land. Was Korach really arguing that Moshe intentionally lied? Another possibility may be that Korach was using this fact as support for a contention that reality had changed and that Moshe's previous status was no longer applicable.