I'm sure there are disadvantages to the outcome, but I don't think imprisonment is a fair punishment (if any). I don't actually know the facts tbh, are children from created from incest malformed in some way? I guess you should put some kind of restrictions on it if that's the case, but aren't there at least dozens of ways this could happen? Aren't there other issues that go ahead and most of the time are overlooked (such as underage sexual intercourse, at times as young as 12 years old or lower)?
I don't know, when I look at the subject I just think that "It's just... wrong", but that's just mostly because i've been raised to believe it's wrong; Honestly, I don't know what makes this that much more serious than other sexual offenses.