I don't know who "Saul" is, so I will try explaining social Darwinism more generally.
Social Darwinism describes the idea that humans, like animals and plants, compete in a struggle for existence in which natural selection results in "survival of the fittest." Some social Darwinists argue that governments should not interfere with human competition by attempting to regulate the economy or cure social ills such as poverty. Instead, they advocate a laissez-faire political and economic system (minimum governmental interference) that favors competition and self-interest in social and business affairs. Most propose arguments that justify imbalances of power between individuals, races, and nations because they consider some people more fit to survive than others.
How does this way of thinking influence Aboriginal policy in Canada?
It is clear that the earliest European settlers were more "fit to survive" than the aboriginals, since they were able to take most of their land and disrupt their culture and way of life. Recently, Canada has taken on a more socialist approach to protecting those that are "less fit to survive" by offering programs that help aboriginals open businesses, afford schooling, and other similar social services.
Many people believe that the concept of social Darwinism explains the philosophical rationalization behind racism, imperialism, and capitalism. The term has negative implications for most people because they consider it a rejection of compassion and social responsibility.