Earlier quoted context omitted.
Sounds like the maintainer writes a lot of code using rust's "unsafe" keyword, and regularly gets issues raised about this (and versioning, and some other bits). This last issue, which included a patch, has pushed them over the edge after it descended into disagreement. Net/net they were repeatedly asked to change coding style, didn't want to, and have decided it's better to just avoid the arguments by not publishing…
The maintainer can choose whatever style they damn well please, if you don't like it don't use it. What is hard about this?
Don't like it, don't use it doesn't really apply to security vulnerabilities in such major packages.
Flaming and personal attacks are not the solution to this stuff, but this drama feels somewhat self-inflicted.