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Badder is not a word in the English language. Worse is the correct word. When using worse, you never put more in front of it. More is pretty much like the -er ending to adjectives. Like with the word pretty you say prettier or more pretty, not more prettier.
If you're looking for a single word that means promoting bad behavior, then you need an adjective. In other words, a word that makes (1) = (2) below: (1) This book promotes bad behavior. (2) This book is <adjective>. I can't really think of a single adjective.