"Rust is a good language and we should use it to write software" is not the same thing as "lol C++ sucks and nobody should use it for anything ever."

Engineering is all about tradeoffs. Responding to perceived zealotry with more, but different, zealotry makes it harder to have actual discussions.

LLVM is best in class at what it does. Until someone else decides to make something like LLVM in Rust, it's not realistic to use something else. That's just engineering. The choices here directly refute these sorts of zealotry claims, that is, it's not incoherence in what's being done, it's that you are attributing something to a large group of people who have a wide variety of beliefs. Overall, people are more pragmatic than you're giving them credit for, that's why rustc uses LLVM.