I am not going to touch on your other points as you clearly have decided your mind.

> why a mistake he committed in personal life would make his file system a taboo to touch.

He is no longer here to fix bugs or improve the file system, it is not that it's Taboo to touch per se. The benefits of ReiserFS are no longer clear compared to alternatives, there's a cost to including ReiserFS (which Reiser acknowledges), no other FS is associated with the name of a premeditated murderer.