I guess Kant said that it is ALWAYS wrong to lie, even in the most extreme circumstances (and not only Kant, see Jonathan Westphal's answer to question 2701). I do not want to discuss that. But would you explain me why did he think that? Why didn't he just say that "in normal circumstances" it's wrong to lie. Or that it is wrong to lie "when no other value is disregarded by not lying"? Or something like that... Why did Kant (and some modern philosophers) feel he should make such an extreme claim? It's just that Kant's opinion seems to be so contrary to common sense that there must have been a good reason for him to have it... What reason was (or is) that?