It's understood in life that there are no second chances; only a beginning and an end.
To a medic, these particular facts are important to keep in mind -- there's no point in ever dwelling on what was or what could have been if what's now can't be stopped or saved.
For a ninja, it's even more beneficial.
You live, you fight, and you die. Ninja are bred and made solely for this purpose. There are no guarantees in the world for anyone, save for death, but for a ninja, those guarantees are even less.
So it only made sense that those medical ninja, those few crazy romantics who came in thinking that they could make a difference, were left feeling more torn apart then the bodies they had been committed to saving.
Tsunade had always been told that she knew how to preach a good sermon.
Now if only she could learn to practice what she preached.