Strengths: Determinism seems to follow from our views in physics. We think that the material world is governed by laws: given enough information about an object and relevant other objects, laws of nature, etc., we can predict what will happen to that object as far into the future as we'd like. But humans are just aggregates of matter, and therefore subject to the same laws. So our behavior should be determined by the properties of the matter that makes us up, just like the behavior of a rock or a tree.