[lolikoisuru]

>why write tests? why improve ux or ui? why help with documentation?

Because these actually improve the project.

[joshuamorton]

Many (decent) developers believe a CoC improves the project, in much the same way that any documentation on the development process or release lifecycle does so.

[jerrysievert]

so do developers who would contribute if either there wasn't abuse, or if that abuse led to consequences.

a code of conduct tends to improve projects when having one can help attract additional people to the project, or keep people there.

[danso]

But documentation is often not code.