http://www.compactlaw.co.uk/legal_glossary/c/contributory_negligence.html
contributory negligence
This where a court decides that you have contributed in some way to the accident you have suffered at the hands of a third party. The more responsibility a court decides you have, the less compensation you will receive. For example, where a driver crashes a vehicle and a passenger was not wearing a seatbelt. The passenger will receive damages (compensation) for any injuries received, however the amount will reduced by their own negligence, in not wearing a seatbelt at the time.
he crashed the vehicle (i assume they did all the relevent checks to see if it was defective or the cause of the accident, if it had been the cause of the crash they probably would have paid out for that)
he refused the treatment that would have saved his life.
theyve paid out 70,000ish for his medical treatment of his choice and kept his wife on his wages and benefits since
IF the driving the truck was human error on his part and the treatment was his choice then why should they be liable for full amount?
he refused treatment that would have saved his life