I think it’s safe to say that the measure problem is still pretty wide open — not just at the compelling-but-speculative level IV, but even at lower levels that are pretty well-established as actually existing, as in the Born probabilities in MWI — so until that’s solved comprehensively enough that level IV multiverse itself either adds up to normality or adds up to confusion that can be dissolved, I don’t recommend deriving any apparently normality-defying conclusions from it, particularly sanity-impacting and morality-impacting ones. For now it’s just a fascinating problem to solve, and the kind of thinking that keeps leading people to invent the level IV multiverse appears to be a step in the right direction, but it’s by no means a complete solution — existence is still decidedly a confusing problem, and the nature and implications of a level IV multiverse are not yet clear enough that there really is any bullet to bite.
I think it’s safe to say that the measure problem is still pretty wide open — not just at the compelling-but-speculative level IV, but even at lower levels that are pretty well-established as actually existing, as in the Born probabilities in MWI — so until that’s solved comprehensively enough that level IV multiverse itself either adds up to normality or adds up to confusion that can be dissolved, I don’t recommend deriving any apparently normality-defying conclusions from it, particularly sanity-impacting and morality-impacting ones. For now it’s just a fascinating problem to solve, and the kind of thinking that keeps leading people to invent the level IV multiverse appears to be a step in the right direction, but it’s by no means a complete solution — existence is still decidedly a confusing problem, and the nature and implications of a level IV multiverse are not yet clear enough that there really is any bullet to bite.