Experts say yes:
“What motivates most mass murderers is the desire for revenge. They see themselves as victims. They see injustice around them and that they’ve been dealt a raw deal,” Fox said.
“They blame others for their own failures and feel that life is just not worth living. Before they take leave of this life, usually by their own hand, they need to get some satisfaction by taking others with them, punishing those they hold responsible,” Fox added.