He's not arguing whether or not we should have property rights. The question is which is more important, property rights or human rights. There are times when these rights clash and we as a society have to pick one or the other.

For example, if a huge natural disaster (like hurricane Katrina) wipes out the livelihood of millions of people and the government hasn't provided aid yet. Should a person who is hungry and lost everything be able to go inside a store and take food? He has a human right to live but that store also has property rights over their products. Some (not all) conservatives would argue that the hungry person should be prosecuted for stealing, while most people on the left would argue the opposite.