I have definitely gotten the impression (as a very peripheral observer of the Rust community) that ideological diversity is not at all the sort of diversity Mozilla is interested in.
We have a common boundary agreement (that's what the CoC lays out), but other then that, you'd be surprised of the number of opinions you'd see.
Granted, some of the very public figures are very progressive/leftist, but they also do their legwork for it and generally keep that on the side when they speak with their Rust hat on.