Our emotions are subjectively aroused. The circumstances involved colour our behaviours.
If a wife or husband accuses their partner of paedophilia out of spite, and the resulting outcome would mean that you are no longer allowed to see your child, I find it difficult to see a person remain cool and sane. But if you were seen to remain unruffled by such accusations, rather than vigorously deny them, in front of a judge, it may be detrimental to your situation.
Yet, if I were to call a random person a paedophile, as I was walking down the street, I would imagine that I would receive a more secure response from them.
Ideally, we would try to always maintain a calm demeanour. But we don't live in an ideal world. There are appropriate times for outrage, and appropriate times for remaining cool.
The hardest part is determining when to respond appropriately.