> I think Rust is more unsafe than C due to supply chain issues in the Rust ecosystem

This is such an incredibly cheap shot. First, the supply chain issues referenced have nothing to do with Rust, the language, itself. Second, Rust's build system, cargo, may have these issues, but cargo's web fetch features simply aren't used by the Linux kernel.

So -- we can have a debate about which is a better a world to live in, one with or without cargo, but it really has nothing to do with the Linux kernel security.