A language that wouldn't give you a way to zero out data wouldn't be appropriate for security-critical tasks either. Just like how a language that doesn't do a

A language that wouldn't give you a way to zero out data wouldn't be appropriate for security-critical tasks either. Just like how a language that doesn't do array bounds checking and permits pointer math (read: a language where buffer overflows are a damn feature) isn't appropriate for security critical tasks. Just like how a language that must be actively fought using clever hacks in order to prevent it from undermining your attempts to guard against common exploit vectors isn't appropriate for security critical tasks.