Eh. The notions of both "good" and "evil" are pretty pathetic and pointless when divorced from context and motivation. Intention is required for any directed action, and it's pretty much impossible to develop a realistic motivation for their intentions.'Bad guy syndrome' as you put it is not sufficient. People criticise Tolkien for his characters either being either inexplicably and irredeemibly bad, or being unquestionably and universally good, but the fact is that is a crass and ignorant view of his creation. Tolkien did not do simple evil, he didnt really do simple good either, but i think Tolkien beleive's man's base nature is to do good and so showed them doing it rather than explaining why.