Realistically, you can't blame the fats even if paradoxically it is their fault. As much as fats shouldn't be allowed in hospitals, banning them isn't the next step. You can also hurt yourself lifting a normal person incorrectly, or even correctly. What needs to happen is nurses need to form some sort of union and legal defence system that enables them to say no when the lift is clearly too much. The current problem is that you can't realistically demand your right to self-preservation because you will mysteriously find yourself out of a job so nurses are choosing their livelihoods over their skeleton. They need to get themselves into a stronger negotiating position that forces hospitals to make allowances and to have the proper mechanical aids and number of people required for the weight. As long as hospitals aren't held accountable for replacing broken nurses with new ones every time they snap their spines, nothing will change.