This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...the first thug who decided to be immoral. Such a society would achieve the opposite of its intention: instead of abolishing evil, it would encourage and reward it.
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If a society pro
vided no organized protection against force, it would compel every citizen to go about armed, to turn his home into a fortress, to shoot any strangers approaching his door — or to join a prote
ctive gang of citizens who would fight other gangs, formed for the same purpose, and thus bring about the degeneration of that society into the chaos of gang-rule, i.e., rule by brute force, int...