The Midwest is full of tiny communities that would look like cults to someone who hasn't lived here- Amish, Mennonites, Pentecostals, Jehovah's Witnesses and more.

A big part of the difference is that- aside from Jehovah's Witnesses, they tend to not be active in proselytizing, and members tend to stay within the groups for longer- their activities rarely make hollywood-style media news because they're not particularly interesting compared to what we more typically think of as cults (i.e. the doomsday cult" in the article).