Should people be allowed to legally own dangerous animals?

I think that people should only be allowed to legally own dangerous animals if they have a permit or some sort of paperwork saying that they can own these kinds of animals. Yes, it is dangerous for the people to own them, but it's their choice to have that animal as a pet. They put themselves in that position. As long as they are treating the animal right and properly caring for them, then it should be legal. A person who adopts an exotic animal has to make sure that the environment is comfortable for them, otherwise they will have troubles adapting. This will cause the animals to constantly be on edge, because they aren't comfortable. They could react badly if they are provoked or uncomfortable. The people need to just make sure that the animals are comfortable and being treated right.