Come on, anyone with magic is dangerous technically. We control forces beyond most peoples' understanding. How you use that magic is what matters. That's... that's just like day one stuff right?

[He bumped his shoulder against Merle's smiling encouragingly.] So far, I'm leaning towards the not evil side of things. But you haven't really told me much of what you do just that you've got chaotic based magic and a kingdom. Which, wow, still kind of blows my mind. I had no idea when I woke up in your bed. Not a very... kingly bedroom.

[It was a little telling that Merle didn't mention what he did as King just that he was one. Dean didn't want to assume that he was evil just because he avoided talking about it.]