**Deontology**: We get a set of rules from somewhere. Eg, the Bible, or try to derive them through logic, like Kant tried. Being moral is then obeying the rules. The consequences of obeying the rules are completely irrelevant.
Eg, Kant figured that lying is immoral. As per deontology, lying is immoral, period, regardless of circumstances. Kant himself said that if the Nazis show up looking for Jews in your basement, it’s immoral to lie to them. (**edit** the question Kant answered was whether it was okay to lie to a murderer looking for a victim. Actual Nazis weren’t around at the time as /u/allthejokesareblue says)
A special note on Kant: Some people misunderstand his view as “imagine the consequences if everyone did X”. Kant didn’t care about consequences, he was all about logic. His idea of why lying was wrong wasn’t “It would suck if everybody lied all the time”, but “If everyone lied, nobody would trust anybody, and all truths would be assumed to be lies, and even the whole point of lying would be destroyed”. His whole point is that if some things were done universally we’d render them logically incoherent in one way or another.
**Consequentialism**: We look at the consequences of actions. We figure out what kind of consequences we want to see in the world. Being moral is bringing about the best consequences.
In most versions there are no hard rules. Lying can be either good or bad, depending on what you achieve by lying. There are many off-shoots of consequentialism: utilitarianism, rule consequentialism, ethical egoism, the list is a long one.
Deontology is based on a series of ethics, kind of moral rules, rights and wrongs, if you will. They are based in various theologies (see; kants universal maxims, etc) and inform what is considered the ethical greater good/outcome in this philosophy.
Is it informed very heavily by a bunch of people’s ideas of what is moral/good and is hugely variable. There are very old school ethics and more contemporary ones. This variability means it’s hugely subjective and one can pick and choose which deontological philosophy to apply.
Utilitarianism is based on consequences….decisions are made to ensure the consequence always = the greater good of all outcomes. It is relatively more objective however still open to philosophical discussion because there are many philosophical layers when determining the net good of an outcome.
This ethic is applied on a case by case basis and there are no other rules or moral obligations to guide your decision other than purely maximising good for the greatest amount of people
Deontology: You run over a bunch of children with your car, *but didn’t intend to.* You’ve done nothing wrong.
Utilitariansim: You rape a woman in her sleep. She doesn’t wake up, feel anything, or suffer any negative consequences. You’ve done nothing wrong.
On a serious note…
Deontology is judging the *wrongness and rightness* of an action by its intent, not its outcome.
Utiliarianism is judging the *wrongness and rightness* of an action by its outcome, not by its intent.
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