Classic Defenders Vs. Attackers

found on reddit

That creepy little graphic is apparently from Emily Carrol's "Through The Woods", and it pretty accurately depicts the asymmetric relationship between attack and defense. Defenders have to be continuously lucky while attackers only need to be lucky once.

Of course, when you introduce the authorities, the attackers suddenly become defenders, and as any number of high-profile convictions demonstrate, their luck does sometimes run out.