Brooks' political ideology is FAR more complicated than 'self-identified conservative'
He is probably closer to libertarian than conservative.
Yes, Brooks is conservative only by the standards of the Times. His function is to write liberal dogma in such a way as to make liberals more comfortable with their own beliefs by providing a "real conservative" who agrees with them, to provide a "real conservative" viewpoint to which liberals can link to reinforce their own views. If the government was moving the country closer to the ideals of Gingrich rather than closer to the ideals of Obama, Brooks would never be making this case; it simply wouldn't fit his and the Times' agenda. As things stand now, Democrats and liberals (but I repeat myself) have everything to gain from the populace paying less attention to politics and changes the Democrats make, so Brooks can be trusted to trot out a case for that same thing.
In this particular case he is committing a very obvious logical fallacy. Saying that two different systems providing equivalent results prove that the system is irrelevant is only true if there are ONLY two available systems AND all other factors are either the same and/or also irrelevant. Neither is true. In fact, both are demonstrably false. For the former, almost every nation has a different socioeconomic system; they are not binary, but are analog, and analog in multiple dimensions. For the second, Sweden is as Hayabusa Rider said quite different from the USA in homogeneity as well as in obligations, enjoying the tacit protection of NATO and the USA without having to extend protection in turn.
By the way, I do agree that culture is more important that policy in determining success, but Brooks is willfully overlooking the fact that government policies create culture. Today blacks work in far lower numbers and have a far worse cultural viewpoint on work and education. Prior to the sixties this was simply not true. If anything, blacks had a better than average work ethic and a healthy regard for education, as blacks had to work much harder for the same amount of success. Well-meaning liberal policies created the problems we see today among the so-called "black community" by rewarding young single mothers for having children out of wedlock and raising them without fathers, combining a repetitive message of hopelessness with a sense of entitlement that made education seem useless. Welfare families (enforced to be a mother and her children so that fathers were at best transitory creatures) were locked into huge hosing projects where the only highly visible rich individuals were drug dealers and other criminals. The "cult" of the individual was smashed and the cult of the group identity was substituted, leading to working hard for an education becoming a "white thing". None of this came over from Africa, which admittedly has its problems; it is strictly a result of well-meaning but foolishly short-sighted liberal policies. Culture has been created and shaped by policy.