That's a broad assumption. No less than I can be in total control of my actions in an emergency, when perhaps a life is at stake and my 'fear' should be paralyzing me... I can be coldly efficient and in control when angered.
Yes, there are individuals who must know themselves and contain themselves from acting in anger... but if what you say were unequivocably true, no parent could sensibly punish their child at the moment of the infraction... and no child can really learn if the punishment comes minutes later... let alone hours.