“One crucial consequence of this metaphor is that immorality, as moral disease, is a plague that, if left unchecked, can spread throughout society, infecting everyone. This requires strong measures of moral hygiene, such as quarantine and strict observance of measures to ensure moral purity. Since diseases can spread through contact, it follows that immoral people must be kept away from moral people, lest they become immoral, too. This logic often underlies guilt-by-association arguments … and strong sentencing guidelines even for nonviolent offenders.” — Lakoff & Johnson, Philosophy in the
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