While this is technically correct, it's tantamount to saying "just don't make mistakes", or arguing that a seatbelt is unnecessary because many are good enough drivers to not need it.
Languages like C and C++ do not prohibit the kinds of mistakes that the NSA told us two years ago lead to software vulnerabilities.
Other languages, like Rust, have higher guardrails built in and make it much more difficult to accidentally create the same failure modes.