Mod-80, the whole assumption of this thread, that the Misa is not a punishment is a mistake. Wherever you will look, you’ll see it being referred to as a punishment. Also, although it will never happen, we must understand it as if it will.
The Gemara asks how we can punish him for eating and drinking, and the Gemara answers that it will never happen. Don’t take this to mean that it doesn’t make sense. It is more an answer to an emotional question. Although the logic is pure that he will definately end up killing people, it is still something that is not in front of our eyes, and therefore it is a hard pill to swallow.
Being that we have a klal that Diracheha Darchei Noam, that the Torah is sweet and peaceful, this is one Mitzva that won’t fit that bill. therefore, Hashem sees to it that it will never happen.
Please learn through the Gur Arye on this issue. He answers all these questions raised. He says, as mentioned above, that Beis Din Shel Matta punishes to prepare the person for Beis Din Shel Maala. Also, he says that this is the Din of Torah. Beis Din is merely doing the Din of Torah.
The Gur Arye also answers your Skila question. He says that when we kill a murderer, it is for a single murder. On the other hand, this person is being judged because of his future, which contains multiple murders.
In order to better to understand the addiction, we must keep in mind that what makes the Ben Sorer Umorer impossible is the fact that he must be brought up in the most perfect conditions. That is the reason, the Maharal says, that his parents must have the same height and voice (whatever that means). In such a circumstance, when he steals from his father in order to eat Davka special meat and special wine, he is walking the path of complete evil. If it were for hunger or sweets, that would be a different story.