It is natural for the immature to harm others. 
Getting angry with them is like resenting a fire for burning.

Shantideva (685-763), Shantideva was an 8th-century CE Indian Buddhist monk and scholar at Nalanda. He was an adherent of the Madhyamaka philosophy of Nagarjuna. Apparently he was one of those people who didn't show up for anything, never studying or coming to practice sessions. His fellow monks said that his three "realizations" were eating, sleeping, and shitting.