It's funny that your original post was an objection to how undefined behavior gives license to screw developers over, but here you are talking about how undefined behavior is like sticking a fork in an electrical socket.
I think it's a perfect analogy to undefined behaviour in C: enormous benefits but also a hazard to be wary of. A lot of people don't understand the benefits, they just see the hazard. Throughout this discussion I've been trying to clarify that, with perhaps limited success.
Think of UB as a probabilistic error. I.e. it is always stupid to rely on it
1. Write code without errors -- sensible 2. Allow compilers to assume the absence of errors -- occasionally sensible, since it speeds up your program
In defence of UB, for the most part they are things that should break your program anyway: stack overflow is never correct. So your choice is mostly to fail badly quickly, or to fail slowly well
Thanks to google making the UB sanitizers you are free to make that choice even in C
Almost any non-trivial software explicitly relies on undefined behavior, including safety critical libraries such as cryptographic libraries, the Linux operating system has rampant undefined behavior that it makes a conscious decision to use. POSIX makes use of undefined behavior for shared libraries (it treats functions loaded from shared libraries as void*, which is undefined behavior).