I haven't read the books since I was a child (my copies were destroyed when the basement flooded) and my memory isn't that clear, but I have absolutely no clue what you're talking about. My impression of Willy Wonka was not of a sadist; when he's mean to Charlie (the "You've broken the Rules" bit) it was a necessary test of Charlie's character which was painful to Willy.

As to the aspersions you cast on Dahl, if authors aren't allowed to have any character do anything the least bit objectionable without being condemned as if they'd done it themselves, books are going to be a complete waste of time.