Draco hasn't done anything (yet, that we know of) to need actual *redemption*. He's still a little boy (15 is a little boy from the perspective of 46) whose worse evil deeds are, as you say, mocking -- and believing in/loving his (evil) father. The boy is misguided, not evil. Not yet.

Exactly--it's a totally different story than anything that's really like redemption. I mean, the spoilt child who became nicer is very popular in kids' books, but I don't think anybody has ever compared Mary Lennox from Secret Garden to Spike.