In addition, if students have toys at school, they will have something to do during their free time. Imagine if there were only big legos available in class to play with. A child might only like small legos, not the big type. They could play with their own toys if they were allowed to bring them. Otherwise, free time will be boring.
Lastly, students should have toys in class because some kids concentrate on their work better if they have toys. For example, back when I was in kindergarten, I had to have a toy to hold in order to focus.