I don't have a problem with this. If I don't want my children to have soft drinks at school, then they wouldn't. I do allow my children to have soft drinks, but they are always caffein free. Never-the-less, if we say that the use of soda machines contribute to obesity and that the caffein is like a drug, we would end up having to fight about every other little thing.
Carbohydrates are sugar and produce a high, but we don't complain about giving our children sandwiches in the lunches provided by the school. Nor have the schools had to fight to continue to provide dessert with their lunch. What about providing Gatorade for sports activities. That's pure sugar.
Should we keep glue out of the classroom in fear that our kids may sniff it?
If the public needs to feel useful, they should take up issue with school reform, the budget, what our kids are learning and who's teaching them. I could name a hundred other things that are more important in our childrens' schools than wether or not they have access to soda machines.