And when making those engineering choices there are different tradeoffs and constraints to be considered. The language to use is one of them. So when a Rust (wild guess) fanboy comes without any background context and makes comments like yours is very telling.

You are correct that bug free software does not exist. But choose a “memory safe” language does not prevent that. A seasoned C++ developer knows how to use memory sanitizers and other tools to guarantee the correctness of its code compared to an average Rust developer that just trust the compiler which, guess what, also may have bugs.