This is a quote from the book "The ​Virtue Of Selfishness" by Ayn Rand
..., make the retaliatory use of physical force a moral imperative.

If some “pacifist” society renounced the retaliatory use of force, it would be left helplessly at the mercy of
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.

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...
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