Regarding the punishment of different kinds of lying: I imagine that punishment is a useful tool if the threat of punishment can prevent people from doing the punishable thing. Since level 3 lying is usually not conciously done (after all, the liar has convinced himself of the lie), it is not easily preventable; it doesn’t respond to punishment well. Blatant lying can be prevented by the liar if he wants to, so it easily responds to punishment, and that’s why we use indignation and punishment against it as a preventive tool—since it actually works.
Regarding the punishment of different kinds of lying: I imagine that punishment is a useful tool if the threat of punishment can prevent people from doing the punishable thing. Since level 3 lying is usually not conciously done (after all, the liar has convinced himself of the lie), it is not easily preventable; it doesn’t respond to punishment well. Blatant lying can be prevented by the liar if he wants to, so it easily responds to punishment, and that’s why we use indignation and punishment against it as a preventive tool—since it actually works.