I mean, the island is disproportionately rich, and doesn’t have a lot of infrastructure, so flying migrants into a tiny local airport in an area filled with snow birds’ houses and summer tourists could be considered “incoveniencing the rich” simply by the island having to help the migrants.
For example, there’s a single hospital on the island. 50 migrants who need to be checked out to make sure that they’re okay would be a strain on the medical infrastructure there if something else were to happen on the island.
It’s why DeSantis chose Martha’s Vineyard. To piss off a bunch of wealthy liberals by having to deal with what he considers a bunch of “dirty migrants.” Little did he know, people in Massachusetts actually care about helping people like them.