I'm not using C and C++ professionally at all so the only place Rust has to fit in is fun or potential long term professional opportunity (assuming Rust is a fair bit more widespread than now by then, otherwise C and C++ win in the native field for employment opportunities), I'll not have fun (and I won't learn anything I don't immediately need that won't bring me fun) in a sea of vitriol against anyone who doesn't hate C and C++ so I'm happy Rust community guidelines forbid such idiocy in official spaces and documentation.
Rust is apparently targeting C and C++ devs but at the same time the ones that like it are going crazy and saying stuff about C and C++ being impossible languages (I agree they are by far the most spartan and hardest in the mainstream right now but not impossible as evidenced by lots of quite reliable software written in it, some that lives depend on).