Show them to create a secure COM component to integrate in .NET can be easier than writing it in C++/WinRT | C++/CLI, using the same VS/debugger integration while being safer, for example.
Repeating ad infinitum in every HN thread about C++ improvements regarding safety, that the only path to enlightenment is rewriting the world from scratch, without any regard for the loss of productivity, tooling and libraries in doing so, always hand waving them as minor inconveniences, is trying to catch flies with vinegar, but I guess I am wasting my Latin as we say back home.
I've said many times there is a legitimate reason to write C++. If you understand you will be shipping memory safety issues, but the advantages of C++ outweigh the memory safety issues that you will ship to production, then I can't argue with that. I've seen game developers argue as much, and that's legitimate! Maybe, for your use case, memory safety problems really don't matter (or don't matter enough to outweigh C++'s other features). But it doesn't do anyone any good to sugarcoat the fact that C++ at scale virtually always ends up with memory safety problems, and while there have been many mitigations there has been no effective solution so far.
Maybe it will change after the HoloLens/FF project, however today is not appealing to many Windows teams.
Some bigger companies are supposedly using Rust (Amazon, Google, MS) on some projects, but these companies have so many things going that they are likely to use most languages in some kind of project. I've also heard that there are several "invisible" Rust jobs, only available through connections - but these are irrelevant IMO. And then there are the jobs where one is obviously not using Rust, but they mention it to score points or dangle it as a possibility.
Until I see a strong market for Rust skills, or my own employer offers interesting Rust projects, it doesn't make sense for me to invest beyond learning the basics. Funnily enough I'm looking into Go now - its job market is one-sided and quite anaemic, but it offers some nice technical benefits and is a piece of cake to learn.