When Einstein overthrew the Newtonian version of gravity, apples didn't stop falling, planets didn't swerve into the Sun. Every new theory of physics must capture the successful predictions of the old theory it displaced; it should predict that the sky will be blue, rather than green.
So don't think that many-worlds is there to make strange, radical, exciting predictions. It all adds up to normality.
Which means that your ethics should not depends on the potential existence of other worlds we have no way of interacting with. In other words, while it might well be simpler (for some people) to reason your ethics by using the many worlds paradigm, the outcome of this reasoning should not depend on the number of worlds.
So, I've been thinking about this, and say I and everyone I know believes that it's possible to be the first one, absolutely, to whistle a tune. This is, for our strange culture, an important ethical belief. That belief is part of what I would call 'normality'. Now, some jerk comes a long and proves MW, and so I learn that for any tune I would consider novel, odds are that it's been whistled before in another world (I'm taking this example from EY in the sequences). So, depending on my normal, MW may add up to normality, and it may not. In a much more obvi...
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