What are Muslims supposed to do when kuffaar publicly burn the Holy Qur'aan?

Answer

Qur'aan burnings and defilement by the kuffaar are a sort of punishment for Muslims who defile the Qur'aan worse than what the kuffaar are doing. Muslims today are the worse criminals who defile the Qur'aan and Islam. When such punishment descends on us, increase Istighfaar. Repent and make dua. There is nothing else we can do in these circumstances.