The market undermines traditional values and traditional ties; it undermines morals, which rest on community consensus. If there is no community consensus, then one person's sense of morals is as good as the next, and neither takes precedence. This may be great for the entertainment industry, but it is not healthy for children, who need to grow up surrounded by the mores and values of their community. As consumers, we should be free to choose. As citizens, we should have connections to the place we live and be prepared to work together with our neighbors on common problems. When neighbors have no common meeting ground, it is difficult for them to organize on behalf of their own self-interest and their community.
What is the top-two concept but an attack on political parties? And what are political parties but the vehicle by which residents organize and collaborate for political activity? I think parties are exactly the common ground Ravitch references above. Without that common ground, we're just a bunch of individuals screaming in the wind.