> Rather that there is only one person ever who goes through all lives.
So what? They're not really meaningfully one person until all the memories get collected. If they each start as a blank slate, they're all functionally separate people. It's not like they're experiencing loneliness during their lives because of any of this.
> If it were true, the idea that I was Hitler and everyone that worked at unit 731 is pretty horrifying.
That part is supposed to be uncomfortable, but I don't find it existentially horrifying. After all, given that Hitler exists, someone had to be him. Surely it's less horrifying for that person to also be all of Hitler's victims.
> There's nothing any more horrifying about this than about bog-standard reincarnation.
Under that wouldn't I be one of many going through some different lives? Rather that there is only one person ever who goes through all lives.