It's a bird feeder. Hawks are birds. Squirrels are bird food.
I used to think squirrels were like vegans, or herbivores, eating only nuts, fruits, and seeds, but I just learned they are actually omnivores, who even sometimes eat small birds. (See this National Geographic article for information about squirrels sometimes eating small birds. So, birds sometimes eat squirrels, and, squirrels sometimes eat birds.)
If I want to feed those rodents (squirrels), I'll get a squirrel feeder, but I want them to leave my store-bought bird feeders and birdseed alone! What the birds and the squirrels do on their own dime is their own business. :-)