The deal Superintendent Alberto Carvalho cobbled together with Key Biscayne would add 1,100 more students to a larger school, with the expansion financed by the city. His plan would up the number of seats available to the county-wide student population by 25 percent, and coax more minority students to enter the admission lottery. But to the utter chagrin of the red shirts, Key Biscayne high schoolers would get first preference to a majority of the new seats — provided they meet the 2.5 grade point average admission requirement (and, like other MAST students, maintain a 3.0 GPA once they’re admitted).

In return, the Village of Key Biscayne has agreed to pay the district $18 million. (Half the money would finance renovations on the island’s K-8 school.) That set red shirts to railing that the wealthy village residents (with a medium annual household income of nearly $100,000) were buying or bribing their way into the prestigious MAST community.

Of course, both sides were fighting for the same thing — their children’s future. Board Member Lawrence Feldman, putting it rather more nicely than I might have, said via e-mail Friday that the squabble came out of their mutual “quest for the best education for kids regardless of their background or zip code.” But it was the kind of quest that made for a long and ferocious school board meeting on a Wednesday afternoon.

But while red shirts and white shirts went at one another, the real culprits were state legislators who, as Board Member Raquel Regalado said Friday, have created a $1.7 billion shortfall, a “capital crunch,” in construction and maintenance funds. Legislators diverted the Public Education Capital Outlay funds, derived from taxes on taxes on landline telephones, cable and electricity, originally earmarked for public school districts’ construction and maintenance needs, to charter schools. What capital funds the Miami-Dade district has must go to pay off bond obligations. There’s nothing left. No money for teachers’ raises for the fourth year running. Nothing to build new schools or maintain old ones. Regalado said the district, desperate to find new funding streams, has fashioned compacts with Cutler Bay, Sunny Isles, Doral, Miami and, now, this contentious deal with Key Biscayne.

Meanwhile, the charter school operators (with all the clout in Tallahassee) are circling like sharks, sensing lucrative new business opportunities in underfunded public school districts. Without a high school, wealthy Key Biscayne becomes easy prey for the charter industry. The deal between the Village and the school district, if nothing else, would keep the charters from poaching another chunk of the district’s high achieving students. And stave off the Tallahassee-driven strategy to reduce traditional public schools to a collection of repositories for the poor, underachieving, difficult, disabled and minority students — kids who never see the bay.

Before the financial crisis, before Tallahassee began this ever-more-blatant strategy to sabotage traditional public schools, maybe the red shirts would have prevailed. Maybe, if MAST existed in a vacuum, they should have prevailed. But in 2012, if Key Biscayne comes up with $18 million, the school district can hardly say no. “The Village needs a high school and is willing to pay for it and for the facilities and needs of an over-crowded K8,” Regalado said, by e-mail Friday. “The parents at MAST want to retain the status quo, and fail to recognize the plight of public education in Florida.”

To the kids who set to work on that leaky old cabin cruiser at Miami Central 28 years ago, both sides in the culture clash out on Virginia Key would look pretty damn elite: red shirts and white shirts, so caught up in their tempestuous discord no one noticed that the old marine job training program had gone adrift in a sea of irony.