Simply that we are mirroring the trends in society at any given time smuggling was an issue in the seventies corruption is an issue today and we faithfully reflect those issues.
But you see our society is still trapped in this binary black/white logic and that has had some very positive implications for our generation. It's had some very negative ones as well and one of the negative ones is that it creates enormous identity problems for people who have one black ancestor and all white ancestors for example.