I personally have no issue with C++ being used for compilers, but to each their own.

Depends on how one stands in regards to secure code.

I love C++, but secure like the ALGOL linage it will never be, no matter how many fixes we throw at it, because that C copy-paste compatibility layer is never going to be thrown away.

I'm quite fond of secure code but attackers don't really exploit memory unsafety in compilers as they're not often in a position to or, if they are, there are much simpler ways to execute code.

Except compilers aren't used in isolation, if one writes the compiler toolchain in C++, chances are other system critical components are also written in C++, if nothing else for the comfort of single language use.

Security must be applied end to end, and not pontual.