The scholars and people of the knowledge [ahlu al-`ilm], amongst them 'Sahib al-Ikhtiyarat', and Ibn al-Qayyim (rahimahullah), and Shawkaani, and a lot of others, and Qurtubi (rahimahullah) in his tafseer, say that if the disbelievers were to kill our children and women, then we should not feel ashamed to do the same to them, mainly to detter them from trying to kill our children and women again.