That is a fantastic question and was asked in this article
Apparently this group CSPI has decided that McDonalds (a private organization) having toys in their happy meals is making our children have bad eating habits. Its not that parents who bring their kids to McDonalds and pay for said happy meals. It's the 4 year old that wants the toy thats being influenced. Dude i don't care they are kids, just ignore them. Tell them no, its really that simple!
Best quote ever
""If you can't control a 3-year-old child for a toy, God save you when they get to be teenagers," Gage told the Los Angeles Times"