The concern from those contributors (and we might soon see the same in QEMU) is that these bindings are essentially a weaponization which forces the great majority of contributors to learn Rust or drop out. Essentially a hostile takeover.
If I am contributing to the Linux kernel already, I presumably have a decent grasp of C, the central abstractions in the code I am changing, the email-based patch workflow and so on. So when my code breaks adjacent code, I should have a good chance of fixing those issues also, and most often, this won't become the main body of work.
If jamming in Rust bindings means the great mass of existing contributors are forced to learn Rust, whether they wish or not, to either maintain bindings or to drop out altogether, then raising the pitchforks is not an unreasonable response.