> A growing population require food.

Sure, but Europe's not growing. It is purely in "shrink forever" mode. This is easily measured, any time fertility drops below 2.1 that's what happens. But ignore that a moment, what if you wanted to depopulate Europe? This might be a good policy for that. Get the timing just right, and it's not even a genocide... food shortages that don't starve anyone just encourages the last few breeders to put a lid on it, and voila! The fantasy of more than a few out there.