When I lived in Switzerland, the French town of Annecy was just across the border, which was entirely open. Understandably so given the ties between France and Switzerland. Yesterday, a Syrian refugee, who had made his way to France from Sweden, stabbed four very young children in a playground in Annecy. I believe one of the children was Dutch and another was British. One child was stabbed in a stroller. All four are in hospital but are apparently in stable condition.
Remember, Europeans have a long history of tribal conflict, infighting and "eating their own". Why are you shocked ?