And this, I propose, is the critical human flaw. It’s not that as a species we’re particularly aggressive. It’s that we tend to respond to aggression very poorly. Our first instinct when we observe unprovoked aggression is either to pretend it isn’t happening or, if that becomes impossible, to equate attacker and victim, placing both under a kind of contagion, which, it is hoped, can be prevented from spreading to everybody else. (Hence, the psychologists’ finding that bullies and victims tend to be about equally disliked.) The feeling of guilt caused by the suspicion that this is a fundamentally cowardly way to behave—since it is a fundamentally cowardly way to behave—opens up a complex play of projections, in which the bully is seen simultaneously as an unconquerable super-villain and a pitiable, insecure blowhard, while the victim becomes both an aggressor (a violator of whatever social conventions the bully has invoked or invented) and a pathetic coward unwilling to defend himself.

David Graeber on bullies and cowards.

One excerpt from a much longer essay, and one worth reading in its entirety.