Yes, when birds fly into a windmill, it’s just “nature” taking its course.
Yup.
Animals always out breed the food supply.
What changes is which characteristics will enable one animal to successfully compete against another to survive.
Before, the bird who saw the cricket from farthest away and flew the fastest got all the crickets. The slower or less far sighted bird got hungrier and more desperate, eventually making a mistake that a predator sized upon or getting sick or flying into something.
Now a bird who sees and avoids the windmill blade will get the crickets, and the faster bird who doesn’t see the blade goes splat.
At the end of the season the number of birds will still be the same because the limiting factor is still the limited number of crickets.