Well, I guess, this has got to be said: security should never be a concern for application software developers.

This may or may not apply to things like systemd which live somewhere on the boundary between what would be pure "system" and "application" programs, but it is undeniably true that application program code, such as that of a document editor or a calculator, should be solely concerned with the application side of things, i.e. correctness and efficient implementation of what is otherwise known as "business logic", and security is usually not one of them - contrary to a very common, but mistaken, perception. It is the "system" component of the execution environment that should focus on what it has been designed for in the first place.

Therefore, ideally, it should not matter what programming language is used to write application software - whether it is C, Rust, Prolog, or SQL; it does sound ironic, though, that the most demanding pieces of a system - demanding in terms of reliability and security - are usually written in an "unsafe" language.