I've drawn up a strict line of morals after several battles with my conscience. I do indeed have a clear line of what's acceptable as a pet and what isn't. Carnivore wise, anything that can and will overpower a person is a no- dogs can indeed overpower people, but trained they will choose not to. With exotics that's not an option, you have to be able to restrain any carnivore, after that they do become a hazard. I haven't looked much into herbivores, but a lot of accidents with horses are indeed simply accidents. The largest exotic herbivore I can think of that people keep is a capybara, which I find a pretty safe animal. Elephants are an admirable animal also, though a male in musth is indeed a dangerous animal, I do have a great admiration for the mahouts who devote their lives to these animals and are true masters of their ways. Kicking musth out of the picture, elephants are extremely sweet animals who form amazing bonds with their people. However an elephant is an elephant, and the only people who should be keeping them are the mahouts of Asia. Asian elephants are actually classified as domesticated even (lines that have been kept for centuries).
For me, the difference between keeping a tiger and a fennec fox is clear when you look at how these animals live with their people.
Like any exotic, they do have needs that need to be taken care of- I imagine those ears would never withstand a house party, for example.
As for me? One day... <3
Again, not a pet to be taken lightly. Serval kittens are becoming extremely popular pets in Europe right now, they are sweet- if you don't mind a huge mess of the house. Probably the only animal that I'd put up with that for. Also, not easy to acquire, last time I checked a single kitten goes for around $10,000 on a spay/neuter agreement. However, they are smart, loving, and very "dog-like" animals. I can only dream.
Edit: Is your fish happy with you?