people forget that chimps and other apes are wild animals. They are very very strong . I read somewhere how much psi their jaw pressure was- I forget the figure but it was more than enough to make me realize a bite could severe a body part no problem. Also many people who get those cute little chimps are in for a shock when the chimp reaches puberty. Raging hormones in a chimp are not pretty. Needless to say no one in their right mind wants to be around a super strong sexually jealous primate. Add that to the fact they are territorial you have mayhem in the making.