Why does no one in the town pay much attention when they hear that Laurie Pye has run away?

In Chapter 18, Matt comes home one afternoon in April after working at the Pyes and announces that Laurie has run away. Matt says that Laurie and Calvin Pye argued and Laurie just walked away. Everyone assumes Laurie will come back when he realizes he has nowhere to go, but no one looks for him when he does not return because everyone in town is used to the Pye boys disappearing.