That is the problem with many umpires. You are more concerned with getting rid of problems instead of dealing with those problems. If that is the only way you feel you can control a game, then do that. I just think that is the easy way out and does not advance umpiring. I have made mistakes in games and never had to eject a coach or they never complained. It is the way you carry yourself that also has to do with how a coach responds. Because if you have a certain demeanor, they might not even realize you made the mistake in the first place.
Peace