Not to defend those who leave early, but I can understand the thought process of the casual fan at Dodger Stadium who has kids to wrestle into a car, a long drive home, and possible early start the next day. As much as I love the Ravine, it's one really huge drawback is that traffic after the game is horrendous. The flip side of being in a secluded park on top of a hill is that there are only a few exits for 20,000 cars.
And if I may be completely selfish for a moment, the more people leave early, the fewer cars will be in my way when I eventually leave. Except for the few times they don't leave early. I once went to a Fourth of July game that had fireworks afterward. Naturally everyone stayed and it was a sellout. There was an amazing moment when we got to the parking lot and saw there were no cars driving around yet. We ran to the car, but pulled out of our spot at the exact same time as everyone else. A near-total standstill for an hour. After about eighty minutes we passed the stadium gates to the freeway and made the rest of the drive home.
I have tickets to Sunday's game and it could be something similar. It's the last home game, so it will be a sellout and people may not be as inclined to leave early.