Abiw
"In certain circumstances busting and airframe/engine limitation is acceptable based on the scenario presented"
OF COURSE IT IS
SAR crews are frequently faced with this quandary, and they often sacrifice (for example) a little fatigue life in order to help a human one. The decision is based on a multitude of factors, and the crew's knowledge, training and experience can help them make it. Safety of the aircraft and crew is paramount, they all understand that the very worst thing they can do for a survivor/casualty is to become casualties themselves. In my experience these decisions are crew-based and I have never known SAR engineers subsequently to show anything but understanding for their difficult plight.
The vast majority of aircraft engineers are intelligent people who undertsand the operational requirements of their and their aircraft's role. Clearly there are exceptions to this.