That might make sense in a world of perfectly rational unemotional robots.
In the real world, if you worked for years trying to make people safe, and you felt (correctly or not) that you were being disrespected while others were being respected for picking at your nits, you might say "fine, fuck you all, have fun," too.
To be clear, I don't know what's going on. A "rage quit" is the most likely scenario IMHO, but this is all very weird.
EDIT: On reflection, a rage quit fits my priors, which say "there's no such thing as free-as-in-beer[1] software." So you and I should both be a little skeptical when I find it the likely explanation.
[1] It does exists, but it's the exception, and each project where it works has its own particular quirks that make it work. The successful ones typically rely on someone having a particular and unusual mental setup that doesn't mind free loaders. Stallman and de Raadt develop software for their own use, and the rest of us can use it, too.