Corporate doesn't dictate wages for McDonalds-its determined by the guy who took the risk on of opening up or purchasing the business(god forbid, I know) The rules set by corporate are the products they can sell and at what time they can sell it. Like when McDonalds seasonly introduces a new sandwich the franchisee is notified by corporate that its coming down the pike and you have to carry it in the restaurant.
If the independent business owner doesnt have the ability to determine his pay structure- there's absolutely zero reason to take on the risk of buying a franchise.
As far as the food stamps- if these folks werent working at Mcdonalds they'd more than likely be receiving even more gvt assistance.