@Suiseiseki And the fact that you can just turn off the security in the code any time you want, and there's no way to write fast code without doing that in some situations.
Nevermind that only the static typechecking (which both C and C++ have) and borrow checker (which is only useful in basic situations) happen at compile time; all the other memory safety features, like array indexing, incur a runtime cost in speed and memory. Just take a gander at some Rust disassembly on godbolt and you'll see it secretly dragging around array size data and doing bounds checks.