Searle's argument is against the free will of human beings. The conclusion follows from his view of determinism and his view of substances. His view of substances is materialist. For him the whole world is composed of material substances. All events can be explained by these materials. This is a view very much in keeping with (accepting) determinism. Determinism states that there must be necessary causes for an event to occur. This deterministic cause and effect relationship is evident in the physical world. The most convinced determinists see determinism as exclusive of free will. Searle, being a materialist, sees humans as just another material substance. Accept determinism and reject free will (libertarian).1. The behavior of every material composite substance is caused in a completely deterministic way by the nature of the material parts that compose it or is caused partly randomly.2. If (1), then, if a human being is a composite material, his behavior is either caused completely deterministically by the nature of the material parts that compose him or is caused partially randomly3. If a human being is a composite material, its behavior is either caused completely deterministically by the nature of the material parts that compose it, or it is caused partially randomly. (1,2)4. No being whose behavior is caused entirely deterministically by the nature of the parts that compose it, or is caused partially randomly, has freedom in the libertarian sense.5. If a human being is a composite material substance, he has no freedom in the libertarian sense. (3,4)6. Human beings are composite material substances.7. Humans don't have freedom in the libertarian sense.......center of the card...is pretty solid. The most accessible way to argue against it is to argue against materialism. Arguing against materialism with a dualist view is only partially successful because it implies that there still exists a determinate material self that cannot be free in the libertarian sense. The only way to successfully resolve the issue is to adopt an idealistic view of substance, based solely on the mind. If you saw humans this way, humans would not be determined and capable of having free will (even in the libertarian sense!) Even bolder would be to try to reject determinism and accept libertarian freedom using a material point of view . While it is possible, it leads to a rather conflicting view. However, the view that makes the most sense is the argument. This seemingly valid argument states that human beings are material which makes them determined, which prevents them from freedom.