To make this work you need to re-define "memory safety" to the point where it loses any value in a discussion about programming

Valgrind has no way to detect trivial global or local array bounds misses so long as they don't stray out of the defined memory. It can't spot this because the resulting executable (the only thing Valgrind sees) is not doing anything that's prohibited - it's nonsense because you used a non-MSL, but the actual executable has some defined behaviour.