For example, a man could allow himself to be triggered into rage. And afterwards there will be no visible signs it happened within him.

But his wife could've been around him, and now she has purple bruises.

External signs are more easily measurable, and therefore reported more, therefore readers assume the most affected.

If the man had internal bio-signals measured, such as HRV, blood pressure, etc, you'd see the effects even BEFORE that of a beaten wife. (Of course there are also long-term health issues for being a slave to rage/anger/frustration)