I agree with you there. These heelies or roller shoes are dangerous in stores. The kids do not care if they hit someone or fall on their faces.
The parents will sue the store that they got injured in if there isn't something done quickly as in banning those shoes from the store and you can bet that the parents of an injured kid with those heelies will sue the store for damages and for a high price because the store didn't do anything to protect the kid from getting hurt when the parents know that those shoes are not supposed to be worn inside businesses with possibly slick floors. The kids will either pull products off the shelves when they hit the shelving unit and they could get injured.
Please ban them before you end up with a lawsuit on your hands.