Non, not really & it looks like the School may have a point :)
Haribo..
Starmix Mini Bag (Haribo)
Serving Size: 1 bag (20g) Calories: 68 Total Fat: .04g Carbs: 15.8g Protein: 1.32g
[[http://www.livestrong.com/thedailyplate/nutrition-calories/food/haribo/#ixzz1t65mdYY3 ]Read more here]
Or KitKat?.
KitKat (Nestle)
Serving Size: 1 four piece bar Calories: 210 Total Fat: 11g Carbs: 28g Protein: 3g
Though it will depend on exactly which Haribo or Kitkat the DCs are eating, & if its class treats you are talking about for birthdays etc, rather than just allowing Haribo in School - then its going to be less often than allowing carte blanch sweets in School -
you also have to remember some DCs have allergies, so seriously so - its going to be very hard for the School to Police keeping allergic kids safe without a blanket ban on them bringing sweets into School, bar for birthday treats etc, where the Teacher will be handing them out, so can be sure the sweets provided are okay.
Personally, as the Mum of a DC who does have allergy problems from eating some sweets, I'm grateful when Schools take this type of approach - its just a shame not all DCs/Parents follow the rules - thankfully for my DD, it won't kill her, but can make her ill - the same can't be said for some DCs with severe allergies, nuts for example - they often show up in chocolate bars