maybe from tough childhoods? maybe they held in anger for a long time and they finally snapped? to me rage is a way to push your emotions away and just let everything out, so maybe thats what they're doing. i hope this helps for whatever you're doing :)
At this the narrator becomes angry at the bird and suggests that it may be a visitor sent from the devil. This is what he means when he says, "Whether Tempter sent." He believes the bird to be a prophet, thing of evil, bird, or devil--some agent sent by Satan to cause him further torment.
