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So why does it keep happening?
So, you're suggesting that "it keeps happening" at SXM do you? Enlighten us further by all means. Do you have any factual knowledge about this airport?
As for recorded accidents, there was an "arriving" accident at SXM in 1971 and that was a DC-3 which crashed 20 miles short due to fuel starvation. In 1972 an DHC-6 crashed on a night approach. In 2014 a Shorts 360 crashed on departure.
Looking at its safety record I would say it is no more an accident waiting to happen than hundreds of other airports around the world.