Bringing reductionism home Quote him. — Frederick KOH
This is a move he commonly makes, as your later chicken soup reference also illustrates. For instances, in
Dreams of a Final Theory (p.62) he argues:
(Weinberg) "Finally, there is the question of emergence: is it really true that there are new kinds of laws that govern complex systems? Yes, of course, in the sense that different levels of experience call for description and analysis in different terms. The same is just as true for chemistry as for chaos. But fundamental new kinds of laws? Gleick's lynch mob provides a counterexample. We may formulate what we learn about mobs in the form of laws (such as the old saw that revolutions always eat their children),
but, if we ask for an explanation of why such laws hold, we would not be very happy to be told that the laws are fundamental, without explanation in terms of anything else. Rather, we would seek a reductionist explanation precisely in terms of the psychology of individual humans. The same is true for the emergence of chaos. The exciting progress that has been made in this area in recent years has not taken the form solely of the observation of chaotic systems and the formulation of empirical laws that describe them; even more important has been the mathematical deduction of the laws governing chaos from the microscopic physical laws governing the systems that become chaotic." (My emphasis)
Notice that Weinberg again assumes that either the emergent laws must have reductive explanations in terms of deeper scientific principles that govern (in this case) the individual constituents of the high-level entities (i.e. the composite individuals picked up by the high-level "terms") or they must be believed by the strong emergentist to be governed by principles that are "fundamental" in the sense that they don't have
any explanaton at all. Functional intra-level, and partly contingent historical, explanations are just ignored by Weinberg.
But Weinberg is also committing a form of projection here. He's the only one who claims that there must exist "fundamental" principles that can admit of no explanation at all. This is what he believes about his prospective "final theory". Emergentists, or pluralist anti-reductionists, need not believe (and few indeed do so believe) that there are laws at any level that are just given and that can have no explanation at all. (Though some of the boundary conditions that restrict their domains of validity may hold in some specific time and area as a matter of historical contingency, and hence need no other explanation than mention of the initial accident). Rather, it is partial
autonomy of the high-level (so-called) principles that is claimed by emergentists to hold with respect to low-level laws. On the question of autonomy, as it relates to emergence, see Karen Crowther's enlightening paper 'Decoupling Emergence and Reduction in Physics',
European Journal of Philosophy of Science, (2015) 5.