Actions at macroscopic level are, most of the time, not affected by quantum noise. Unless you’re very, very close to the threshold, a whole neuron firing differently in your brain has a very, very low probability (remember probability are multiplicative) which means that in most cases, all the worlds with significant Born probability (non-mangled ones) will have you acting the same (or the sociopath with a knife acting the same).
If I understand you correctly, what you are saying is that if something like “mangled worlds” holds true it may be that if someone is killed in one universe they are killed in every other universe a perfectly identical version of them exists in, because the quantum differences in those universes never add up to a big enough effect to “save” them. This seems plausible to me, and fits well with the sixth reason on my list.
If I understand you correctly, what you are saying is that if something like “mangled worlds” holds true it may be that if someone is killed in one universe they are killed in every other universe a perfectly identical version of them exists in, because the quantum differences in those universes never add up to a big enough effect to “save” them. This seems plausible to me, and fits well with the sixth reason on my list.