*their
Also, not all failures are caused by "not doing there job right", especially when venturing into new territory. The Tacoma Narrows Bridge, a classic example of a disastrous engineering project, pushed the envelope and collapsed, but not because the engineers didn't do their job right. There hadn't been a bridge of that size with that design before, and aerodynamic concerns weren't taken into account. If that bridge hadn't collapsed and taught the lesson, some other bridge would have.
You can never remove all risk. You may call that 'passing the buck', but blaming all failures, regardless of cause, as "not doing there job right", forces a stone-age technological capability.