Fish make much better pets than chimps, in my opinion.
Exotic animals should just be outright banned as pets. There are too many foolish people out there that simply do not recognize the magnitude of what they are taking on and certainly don't think hard enough on the ramifications should an incident arise.
Exotic animals should stay in their natural habitats or in zoos. If you want to see a monkey, pay a fee to get into the zoo. This is much cheaper, and definitely much safer than trying to take in a monkey as a pet.