How to be evil... hmmm...
I don't think I've ever seen/read "scary" baddies, unless it was a spook movie.
In order to hate the villan, you need to be able to hate someone, which isn't that easy.
Think of it this way: The baddy thinks he's doing something worth-while. It might be illegal, but it's right to do it. The villan is acting within his moral compass (even if it's 180 off everyone elses).
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