You’re making a lot assumptions here.

For one. You don’t have to be a vegan to care about biodiversity. It is as simple as choosing to care and being selective in sourcing your groceries. That goes for produce as well. Since many farmers use pesticides that kill bees, or fertilizers that damages ground water.

I know you have different morals when it comes to choice of protein. But that does in no way prohibit one from caring about species as a whole.