People need to understand that working at a fast food restaurant isn't worth the money you're making. It gets completely insane at times, to the point where $22/hr would be an acceptable wage which is why these people are asking for an increase. However as others have said before, you can easily be replaced. The wage you are paid isn't more so what the job entails/how much work there is, it's more of how difficult it would be to actually replace you, it's why being a manager gets you paid more, because they can't just hire anyone off the street to take your place.
If you riot, who cares? The company will cut their losses and give the jobs to people who aren't picky and NEED a job. These people should be happy they even have jobs as some people can't even find work at all and would be more than willing to take their place.