If people were free, crime would disappear. Prosperity for all is only possible where crime is controlled. Government makes it possible for the best people to rise to the top. The function of the police is to oppress those who are just trying to survive. No creature can ever claim ownership of any other creature.
Stronger creatures use slavery to take advantage of the weak.
Slavery is a reasonable solution to certain economic problems. Some people deserve to be served by others. The government which governs least governs best. The one who always does good need not fear the law. Without law, society would collapse.