Let it be or intervene. Even in the simple act of eating, is one creating or destroying potential? Someone else could have had that grain. That grain could have become a whole ‘nother mother.
Such suffering. The one lashing out suffers themselves; whether they recognize it or not, they harbor suffering. Rather than pray for their decay, pray for their transmutation; when all is whittled away at the end of the day, some toxins persist. This is why “two wrongs do not make a right”: to respond to the propagation of suffering with further propagation of suffering does not decrease suffering.
Put yourself in another’s shoes. We all suffer at times. Why would you behave in such a way as to cause the suffering of another? If you are at peace, would you cause such suffering?
May peace be upon oneself.