The claim that this is bad for the Dutch economy is nonsense. A huge number (probably most) Schiphol passengers are using the airport for a layover. They aren't staying in the Netherlands, they're not spending money there (at most some coffee or something but it's duty free), and it doesn't create many well paying jobs for people living in the Netherlands.

Most of the money Schiphol brings in stays in the pockets of people who are already rich and the jobs it creates are mostly poorly paid (like luggage handlers, staff at shops, etc). There's plenty of open vacancies for jobs like that already, we don't need an extremely loud and polluting industry for that.

Schiphol is too big as it is. The Netherlands is a small country and it doesn't need such a huge airport. Why does Amsterdam need to be some hub for Europeans to fly across the world or to connect the Americas and Asia? Why must the Netherlands be even more polluted to make traveling slightly more convenient mostly for foreigners?