Imagine this: you were in a hurry this morning, and on your way out of your apartment building, you didn’t hold the door for the lady who was following closely behind you. Because she was not expecting to have to catch the large and heavy door, the door slams on her fingers and a few of them are broken. You, of course, have not noticed because you are already across the street and in the subway station before the woman even yells in pain. This woman, a doctor who lives in your building, was supposed to perform urgent surgery on a very important person at work that day. Another surgeon had to do the surgery, but because this surgeon was just a little less experienced, the patient died.
As it turns out, the patient was a key player in mediating peace talks between nations in a conflict zone – that was part of why the operation had to be done so urgently. Nonetheless, his death meant that negotiations ended, and war broke out, ending millions of lives on both sides.