As the flow of a river on the big scale the flow of the universe might be entirely predictable. But we are living on the smallest scales of the universe. So we

As the flow of a river on the big scale the flow of the universe might be entirely predictable. But we are living on the smallest scales of the universe. So we might simply not experience this determinism of the universe, as a molecule in the river might not notice that the river is flowing into the sea.