Because of this.
Runners on first and second, down by a run, bottom of the ninth, one out.
The question of whether to bunt in this situation is probably subject to debate (not really, see below)
Keep in mind, however, that when the batter is Adam Dunn, there really ought not be any debate. Adam Dunn. Big guy (6’6″ 240 lbs), slugger type (.518 career slg). This guy:
That’s who manager Dusty asked to lay down a sacrifice bunt. The man who has two sacrifices his entire career; who’s leading the team in home runs and RBI. Yeah, that’s a good call, Dusty. Luckily for the Reds, Dusty’s managing didn’t get in the way.
After two unsuccessful sacrifice attempts, a frustrated Dunn chose to swing away.
Dunn’s backup plan sailed 449 feet into the right-field Sun Deck for a three-run walk-off home run, lifting the Reds to a dramatic 4-2 victory over the Indians before a standing-room-only crowd of 42,023, the 11th largest at Great American Ball Park.
How does someone who manages like this have a job?
This is not the first time this has happened, by the way, Dusty calls for a bunt from someone who shouldn’t be bunting, and that person hit’s a walk-off homer instead. It happened another time this season (to Edwin Encarnacion).
On bunting generally: With me on first and second and one out, the run expectancy is .971. With men on second and third and two out (the presumed outcome from a sac bunt), the run expectancy is .634. Dusty chose to cause one of his best hitters to attempt to reduce the probability his team would score a run by 32%. In the bottom of the ninth, outs and baserunners are more valuable than bases. Why anyone would be bunting in that situation, let alone Adam Dunn, boggles my mind.