It depends on timescales, and whether or not there is any real advantage to cloning. I don't see it at this point as anything other than a curiosity, something that we can look into doing just because we can -- though that could equally well apply to other less controversial areas of science.
In the long-term, if cloning is ever developed and becomes successful, then they would probably become a part of society like any other, with equal rights and probably equal problems. Not at first, though! Humans are very good, it seems, at finding a reason to hate people who are different. Clones would surely be looked down on as "fake life" or something equally unfair.
Because a true clone would be a human just as much as I am, so he or she would have the full ability to be aware of society, and values, if educated properly. So a clone committing a crime should face the same laws as a human.
Interesting point about the "for the wrong reason" cloning. Though this might not be too much of an issue as the technique is probably going to be (a) very difficult, and (b) very expensive. Also a clone would grow and develop at the same rate as a "normal" human so it would be a long-term project to make clones for trafficking or prostitution.
That's all I can think of off the top of my head. I've never thought about it before except perhaps to think of the speculation as fairly pointless because "it ain't gonna happen".