The anthropic principle gets in the way. If you play classical (i.e. non-quantum) Russian Roulette 10 times and live, you might conclude that there is some force protecting you from death. If you play classical Russian Roulette 10 times and die, you're not in a position to conclude anything much.
Good point, I missed that. So MWI seems to be even subjectively unconfirmable...
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