There are excuses and then there are excuses and damn everyone has a bunch of excuses and really, why have excuses at all? I do it too, no question. I am a master at that stuff- The blame game.
Well, it wasn't MY fault. He did this or she did that and I tried but they didn't listen and I tried to get there on time, but that darn alarm clock and it wasn't my fault! Yeah it was , you big dummy, you were in charge, plus you are responsible for yourself and your actions, all of them, so it is your fault.
Prepare yourself better, prepare your people better. Get it right every time until everybody knows everything about the task at hand , over and over, until they can do it without thinking about it.
And then if they still screw up, figure out what you missed in your teaching and keep going back over it.
Elimination of excuses.