Why did Brightline go top-and-tail instead of push-pull?

Why did Brightline choose to put locomotives at each end of their trainsets instead of just have a locomotive at one end and a cab car at the other? Why do they need two locomotives on each trainset?

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Can't say for sure but there are lots of grade crossings on their route.

I'm sure that's it -- pedestrians and motorists there seem attracted to Brightline like moths to a flame.

I'm sure better acceleration and speed probably played a role too, since I think the plan is to go faster as they expand

Not sure if they're still running four cars, but the plan was to expand train length as ridership increases, and one power car won't cut it with seven cars.