Yah, I understand what you're saying on the whole. It's just bits and details of what you're saying that doesn't mesh well, in my mind at least.
For example, in #2, about how punishment should be determined by motive...I don't see where the enjoyment factor of the victim comes in. Her motive was to find sexual satisfaction and break the law doing it. That is what her punishment should be based on, whether or not the boy couldn't keep clean sheets at night thinking of her or made a vow to go homo- or asexual for the rest of his life. I can see where the boy's reactions could determine the severity of the punishment, but I don't see how it has anything to do with the punishment determination. There's two basic steps from first court appearance to being locked away: 1) guilt determination in court, where we try and find out if the person really did it or not and, if guilty, punishment is recommended for that crime 2) sentencing, where we try and find out how accountable this person is, based on why they did it, victim's pain and suffering, their net gain for everything, so on. For example, to wit: What she did comes with the price of having a scarlet A slapped on her. The reason she risked that A and how the boy is doing afterwards determines how large and bright should that A be.
That's how I see it, that's the part of your argument I don't quite get. If all I did with all them words up there is restate what you meant, then never mind!