why should it be the design criteria? if people cannot behave, in a safety critical environment - those people shouldn't be allowed in that environment in futur

why should it be the design criteria? if people cannot behave, in a safety critical environment - those people shouldn't be allowed in that environment in future. no! the wing design won't change because a 200 lb man wants to jump on it on a whim. that is not its intended function and such failure modes should not be part of this conversation. 'hey lets make entire cockpit out of heavy steel, since we never know some pilot could lose his cool and break some buttons'