How we cite our quotes: (Chapter.Paragraph)
Quote #1
And that was why New York—or someplace—was imperative. In the end you always crashed against the unspoken barricades of their love, like the walls of a padded cell. (2.187)
Susan's thinking about her mother's love as a padded cell: she needs to escape that love and to escape the community. Jerusalem's Lot is a stifling trap of unholy love—and that's even before the vampires show up.
Quote #2
He had overthrown his own personal maxim for the first time. You don't s*** where you eat. (3.240)
Larry Crockett actually has a sense of community: he generally doesn't do his crooked land deals in his own town, where they could affect his neighbors and his family. Larry kept his own community clean… until he decided to defile it with, as it turns out, vampires.
Quote #3
The female lead (Ruthie Crockett this year, probably) would fall in love with some other cast member and quite possibly lose her virginity after the cast party. (3.283)
Matt is musing on the yearly school play, and how the same thing happens every year with different players. The school play, including the female lead falling in love, is a kind of community ritual. In some sense, the vampires interrupt that: there is no play. But Ruthie does (symbolically and maybe literally) lose her virginity when Dud Rodgers changes her into a vampire. So you could say that the vampires are simply continuing the community tradition.