Yes, if I have various kinds of entanglement and dependence on someone, such as living together, sharing finances and expensive objects like a car, sharing large parts of our social lives, and possibly having children, I don't want them to be able to leave at a moment's notice. This doesn't make be feel especially evil.
Really? I'd suggest you don't want them to have a positive expected value on leaving at a moment's notice rather than wanting them restricted, but in any case... the solution is to structure your entanglements and dependence in such a way that this opportunity is available to them if they desire it, not to try to force contracts and obligations onto them in order to restrict them.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.