While that is true, there is no shortage of rabbits and places to rabbit hunt.
Similar with squirrels, plenty of places to hunt them, and plenty of squirrels.
Speaking of squirrels, this is one game species that permission to hunt is often just for the asking & "free", but with one caveat: "Long as you don't do it while we're deer hunting, you're welcome to squirrel hunt here all you want."
I personally deer hunt more than I squirrel or rabbit hunt, but maybe many of us, including myself, have missed a bigger picture by having so much our focus on mainly deer hunting.