Why do some of us attack people we know are hurt and venting?

Some questions posted here, clearly are posted out of pain or hurt from a recent break up or experience.

"Hurt people, hurt people" is a famous saying.

Some of the language used by hurt people include "why do all men/women..."

Why do so many of us revert to attacking that person who is clearly hurt? Instead of spreading love? How is the world ever going to change if we don't? Thoughts?

Why do some of us attack people we know are hurt and venting?
Why do some of us attack people we know are hurt and venting?
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