Maybe this map will help.
The current does parallel the coast. The issue is Bonnie's arch is right on a corner.
When there is current at LHP or Macabuca (blue arrow) it runs in the blue direction. So if you mis-judge the current, worst case is it pushes you further along the shore. The current abates as you get closer to the ironshore, so you could surface swim back in some cases, or at least climb up the ironshore in a worst-case.
When there is current at Bonnie's (pink arrow) the current will not take a right hand turn and follow the reef, it goes straight and blows you out to sea. As Bonnies is the very last dive site on that corner, you don't have much room for error if you mis-judge the current.
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