I know what you are saying and I agree that it was a dirty play. At the same time the LMU players do not want to give up a dunk on their home court.
Klay Thompson from the Golden State Warriors got injured on a similar play in the playoffs last year. It ruined the Warriors chances. Dalton has to know his value to this team.
Anytime a player drives that hard to the basket in that much traffic the chances for injury are increased.