Some approaches to safe systems design aren't reasonable. In particular, the idea that cars should never go faster than the speed at which a fatal injury might occur if there's a conflict with a vulnerable road user is mostly nonsensical.
While they're not impervious, at least you know where you stand with a good, old fashioned dumb lock. That's in stark contrast to so-called "smart" locks, which studies have repeatedly shown to be easily compromised with minimal effort.