What you're missing is the Nola has the highest port tonnage in the country. The impact on GDP is estimated in the hundreds of billions. There's also billions and billions of dollars of infrastructure here.
Most goods that pass through to the midwest and rest of the country come through here.
Without Nola, hundreds of billions of dollars of the economy will go away. Gas prices set a record after Katrina.
14 billion is a bargain to keep this city going.