Probably every single death was avoidable with less than a day's work to prevent it
This is where I disagree with the idea that Hammond's culpability as a representative of capitalism was downplayed. He keeps saying "We spared no expense" but basically every problem is because they spared many expenses. Sure, they spent money on the little luxury details to make it an attractive park, but they overlooked or cheaped out on everything that wasn't directly part of the value stream.