If they're exporting crops that's about feeding somebody. People who would have to try to get their food elsewhere and have to worry about the standards/quality of those new sources. It's even perfectly fine for people to grow and sell flowers. There may be ways to make it more efficient, and maybe the government should be encouraging that so they can buy up some of the saved land, but I'd bet there are ecological consequences to paving over flower farms too.
Economically it would make more sense to import food from France, Spain etc. it would reduce the cost of living for the overwhelming majority of people with limited negative economic impact.
Also, good portion of it isn't even meant for human consumption. Think flowers or cattle feed.
This is not about feeding the population or about sustainability. It's simply about profit.