I'm not really a fan of running up an already-unbeatable differential in a game but completely agree that unwritten rules are just boring and awful. While I groan when I see someone do what Kapler did, I also don't get worked up about it. When a game gets to that point, I mostly want it to be over both because it's a bad game and because injuries are less likely to happen if, you know, nobody is actually on the field and/or trying very hard...
But again, who cares that much anyway? Get over yourself, baseball history and "tradition".