Agree. Expressed well and measured. And it is learned by expressing badly first and then one gets better. When kids have a tantrum it is a good opportunity to make them aware of it and allow them modulate it. But if one doesn't let them express or gives no attention to their expression it can foster other emotions and delays the learning of modulation.

Unconstrained expression of anger is usually a result of long term suppression and then falling into the trap that suppression doesn't work so modulation will also not.