Jiro comments on Rationality Quotes February 2014 - Less Wrong
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It could be, if you subscribe to a weaker version of Kant's "ought implies can" that says (roughly) "ought implies psychologically feasible".
The basic thought here is that moral principles are suspect if they are SO difficult to follow that practically everybody is just always drowning in akrasia & hypocrisy. Think of a moral code that forbids talking, sex, and non-bland food for everyone - it's not physically impossible for humans to follow such a code, so it doesn't violate Kant's original dictum, but it's just not reasonable to expect it to happen in practice.
So I could see an argument that says that asking all humans to be monogamous is like asking them to take a lifelong vow of silence. I don't buy that argument & I actually think monogamy is important, but the logical structure makes sense to me.
Since most people have probably stolen some nonessential thing at least once in their lifetime, the same reasoning means that a moral principle of never stealing nonessential things is also suspect. You'd have to have a principle "don't steal too often" or something like that, not "don't steal"/
If most people have stolen something (have they?) it seems more likely to be out of carelessness than out of irresistible temptation. If you asked me to go 5 years without stealing anything, no problem. I promise I'll never try a raisin from the bulk bin, or use vidtomp3, again.
No sex, talking, or spicy food for 5 years? Even if I could form the intention to do that, I'll fail miserably. It's not a reasonable thing to expect oneself to do.
I don't think so, especially if you also count the ‘theft’ of non-rivalrous goods such as soft copies of copyrighted material. (I dunno about how we could set about to find out who is right about “most people”, though.)