[kbenson]

You either waste a small amount of time up-front defining what's acceptable and how people should deal with each other, or you waste what's likely much more time the first time people have a major problem that could have been avoided with some sane defaults. And then you're faced with the choice to spend more time setting some sane default expectations, or you put it off until the next problem.

The real difference in why the kernel can work with that and other projects can't is the D in BDFL. What Linus says goes, so there's an ultimate arbiter (for better or worse) that can settle these problems, and set the tone. The LKML doesn't need a code of conduct because Linus is the example of conduct, which in this case is "words don't matter put up or shut up". That'f fine, as long as you're aware and okay with marginalizing the people that don't deal well with that, which can, and has happened on the LKML. But that's a choice for Linus. Rust doesn't have a BDFL, so there's no ultimate authority to define what's right or wrong for Rust and the community around it (as much as a BDFL can for something at large as a language). In that situation, a code of conduct that exists to set some sane defaults can be useful.