I think that simply the fact that you're concerned about this interest is a sign that you probably won't decide to torture animals or anything like it any time soon
. I know that I am also fascinated by the psychology of peoples' decisions and attitudes (one of the reasons that I chose to major in Psychology when I first entered college a number of years ago), and I enjoy reading about and learning about various things within this field, if also to improve myself, too.
I think that you're probably just a worry wart. Your interests are probably just a sign that you want to learn more about what makes things tick, and I wouldn't really consider it to be more than that.
BTW, how old are you? Are you in college/planning to go to college?