The martial art of Aikido teaches that moving with someone's force is far more powerful and effective than to take out the big guns by presumption. The law of non-resistance and energy conservation is quite useful here. Move with the force to fully understand it. See it from their point of view. It might just get 'handled' through your willingness to deeply listen.
Most people are aware of what's at the root of their anger.
Just ask them. Broadening your shared view to expand their peripheral vision helps alleviate the blindness of intense emotions. Next article provides productive ways to give feedback when you are angry to make sure you get your message across. Legal terms for this service.