You're talking of 'feelings'? You probably have a point although honestly I would view him more evil had he been a serial murderer. But I'm saying that as yidden we do what the Torah says, so in case where a person isn't a rodef not only we aren't allowed to maser him to secular authorities, there would likely be a mitzva of pidyon shvuim to get him out, despite the amount of evil he has done.
Just pointing out that the “disturbed” feeling you posted about was grounded more in hergesh than Halacha which probably amplifies that you still feel a certain abhorrence, fear, and disgust towards murder that you (and most of us!) don’t feel towards abuse.
I don’t know what the true Torah hashkafa is. But I’m probably less disturbed about the sentence than you are. I view him as a sadistic monster.
What are your thoughts on Levi Aron’s life sentence? Are you disturbed by the excessive length? He only murdered one child, and is a complete broken man who has already spent more than half a decade behind bars.
Weberman destroyed countless innocent lives for his own self-gratification.