Its about being considerate. As you know in food courts its always a rush. And only a few workers on duty and you have to go hunt them to clear up someone else's mess so you can use the table. And the mess can be horrid! Now if each one just cared enough to just go empty their trays imagine how much more better it would make the situtaion? Specially for mom's like me who go to the malls alone with just our kids, trust me it makes a huge difference!