My experience says that codes of conduct are written with the express desire of keeping all open source communities left-leaning.

I've talked to many people about the matter and some of them say that open source is supposed to be left-leaning, and that those are its principles. That ignores that right-leaning users should also be able to benefit from open source values (privacy, for example) and contribute code, and that not everybody who uses open source has to be a supporter of the open source principles (for example, I use an open source browser because it's the best, not because I like open source better than closed source).