I'd mainly just like your thoughts on it...
I actually wanted to write more toward this but felt that the post was getting too long. So thank you for the question, it’s an excellent one.
First of all, I would like to open the question up. Without inappropriately getting into my opinion on mental disorders (psych undergrad), I’m going to simply state that we all have the capacity to find fun in ways that negatively influence other people. Your example of harming or manipulating another person is easier to talk about if we can attribute it to a disorder. Easier, but we’d be missing out on some important introspection.
The German word Schadenfreude (pleasure derived from the misfortunes of others) comes to mind. I’d prefer not to ramble about pleasure vs fun right now, suffice it to say we can all think of situations or anecdotes where we’ve had what we would call fun at the expense of someone else.
I think fun is considerably intrinsic. In the sense that, what you find fun is a matter similar to what you find tasty or what you find sexually appealing. For whatever reason - through billions of years of selection, the particular expression of genes that is “you” has certain inclinations as to what you find fun. And yes, often those inclinations include finding fun at the expense of other people. But that’s a pretty short sighted take on fun. I mean obviously that’s only a fraction of what any individual finds fun. Whether this socially malignant fun becomes the path of least resistance - the most rewarding way to find your fun - that is a matter of social construction.
See, I don’t think very many people ever stop having fun. Even into old age, even the ones who seem serious and humorless. We just stop encouraging people to have fun, and at a certain age we encourage them to hide it for the reasons I got into in my last post. So instead we find fun in ways that society accepts, in ways that line up with our career goals and serious responsibilities.
And this is where a dangerous positive feedback loop happens. The people who allow themselves to have fun at the expense of other people have an arguable advantage in the business / career world over those who do not. If you can derive pleasure, motivation and satisfaction from “cut throat” activities, you’ll be better at them. People who might not be inclined to find fun in this way now feel a systemic pressure to start.
I don’t think that this is the entire story (and I think in a lot of cases that “advantage” is illusory - just very convincing). But it is a prevalent story.
I think that the behaviors and business practices that are enforced when you find fun at the expense of other people aren’t sustainable. This is, of course, a matter of perspective. As an individual it might be the best strategy to take every advantage over other people that you can. However, when you look at it socially, as a member of a society, it becomes a lot harder to argue that this strategy is doing us any good. In other words, we can fight over the crude oil we have now and make sure we have enough for us and our children. Or we can work together and figure out an alternative so that none of our children need ever worry about it again.
Maybe I’m walking the dangerous line into “socialist” territory, but it’s a pretty firm belief of mine that when we act in the interest of the group, everyone is better off. Of course, we can’t stop people from finding fun in the expense of other people. But we can stop ignoring the alternatives - that we have intuitive inclinations toward working cooperatively and constructively with one another. That we can teach these alternatives. And rather than preach the merits of cooperation, if we can show people how to find fun in it, they’ll seek it out for themselves.
TL;DR: I’ve never read any research, but I’d imagine that physiologically it would be very similar. At the very least, an important difference is the social merit of the fun. Without guidance I think we’re all more inclined to seek fun at the expense of other people. This is an important reason why we need to educate our children on more productive ways of having fun.


