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 obvious sense, if my normal is Newtonian physics, MW doesn't add up to normality either.
So what does adding up to normal mean? Consider that my other stupid question. Egan's law seems to go un-argued for and unexplained. If it just means what the paragraph you cite says, then MW may well abolish or come into conflict with our ethical ideas, since apparently it comes into conflict with all kinds of other ideas (like false physical theories) and none of this requires the destruction of the solar system or flying apples.
So what does adding up to normal mean?
It means that if in your branch you are the first one to whistle the tune, there is no one else in your branch to contradict you. (Just as you would expect in One World.) In some other branch someone else was first, and in that branch you don't think that you were the first, so again no conflict.
if my normal is Newtonian physics
Then "adding up to normal" means that even when Einstein ruins your model, all things will behave the same way as they always did. Things that within given precision obeyed the ...
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