I do agree that is doesn't seem logical. I think it is a numbers game. if it was only a few people connecting they'd have to hold the plane a minimum of a 30 minutes lets day. And probably longer for baggage and the like. So if there was a significant amount on that flight they would do so but if it is a small number of passengers it's better for them to get the flight out to free up the gate and not arrive late in EZE. Personally I think the flight should have more of a buffer as LAX flights are often delayed in my experience.