“Kid, part of the money from those cookies goes to an organization that chops up babies inside their mommies and then pulls out the pieces.
I can't buy your cookies.”
It's really simple, and there is zero morally gray area.
There are plenty of other brands of cookie.
Okay - so don’t buy them, don’t even have to approach them to tell them you won’t buy them ... I mean, I can get chocolate mint cookies anywhere ....