Riots because of Nutalla discount in France

I first read about that in the Guardian article 'They are like animals': French shoppers brawl over cut-price Nutella. The supermarket chain Intermarché had given a 70 % discount on 950 g jars of the chocolate hazelnut spread of Nutella, which made it cost 1.41 Euros instead of 4.50 Euros. This had led to massive runs and riots. Nutalla was sold out fast in some places and they sold amounts in one day what would have been sold in three months normally. A German article of Der Westen reported in the video of no injuries. The Guardian article however does mention that a woman took a box and hair of another one pulled out for example. For a jar of Nutella? Seriously? According to the Der Westen article they are working on a discount maximum of 34 % for foodstuff now. I have doubts however that this will prevent riots like that however.