Your rhetorical question suggests you thought lots of fentanyl is coming on boats on the ocean. This might be a good moment to pause and reflect on where you get your information and how you reach your conclusions.
Boats with 3-4 outboards on the back carrying large bails of some unknown "cargo" transiting well-established drug routes is obviously not a "dubious" connection. We also don't know what the intelligence was on the ground which I'm also guessing was quite substantial.
Neither you or I have the faintest clue what information was available behind the targeting decisions. Reality and your desire to frame things to justify your hatred of Trump are two completely different things.