AIDS
Did anyone else feel Tsotsi was making a statement about the AIDS epidemic? Besides the AIDS billboard prominent in multiple scenes, did anyone feel Tsotsi's mother may have been dying of AIDS? I felt the father was angry/hardened to the fact the mother was very ill (perhaps suggesting she had become HIV positive from being with another man). I also felt the mother, by telling her son to come to her when she was ill, did not have an airborne communicable disease as most mothers would not put their child at risk. The father then yelled at the son to stay away from his mother, perhaps as a way to punish her.
ALSO, Tsotsi brings the formula to the lady to feed the baby, asking "What's this for?" and the lady responds, "It's for mothers who can't breastfeed." Perhaps the mother of the taken baby also had AIDS (as AIDS can be transmitted through breastfeeding), thus reminding him of his own mother and his love for her. I don't know. Just a thought that I couldn't get out of my mind.