During summer break kids sometimes forget what they learned the previous years. But that will be the end of that. If there is school during all the breaks teachers have more time to teach the kids and kids won't forget what they learned since their is no "free from school" period.
Some kids in school are bullied and for them its like there dream that never wanted to come true. The worst part is that is being more and more common in US states and countys in states. Also parents have to go pick up their kids up 2 months extra and july and august is the time for kids to have their break