Plus, the midbrain isn't the "thinking" part of you, it's just urges, drives and the maintance of bodily vital functions. It would be like saying "I'm going to intergrate my breathing, or my heartrate" huh?
The BEAST is just there, a drive for a substance that hijacks the reward centres, brings on intensely pleasurable feelings and is incrediably poisonous to the body.
I would not think it was something to be loved or hated about yourself, it's just there, performing a misguided function, mechanically so to speak.
The things you do under the influence might lead you to hate yourself, or doing it when you know, with the thinking part of you, that you don't want to. But I understood the BEAST itself, to be an unconsious drive for pleasure, it doesn't have a personality for you to like or dislike?