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You know why the fence was built. The original reason no longer applies, or maybe it was a completely stupid reason. Yes, you should tear down the stupid fence.
And yet, there is a worry... might the fact that you see this stupid fence be an anthropic evidence that in the Everett branches without this stupid fence you are already dead?
As with many anthropic considerations, there is a serious problem determining the reference class here. Generally an appropriate reference class is "somebody sufficiently like you", and then compute weightings for some parameter that varies between universes and affects the number and/or probability of observers.
The trouble is that "sufficiently like you" is a uselessly vague specification. The most salient reference class seems to be "people considering removing a fence very much like this one". But that's no help at all! People in other universes who alr... (read more)