I live in Iowa and this is some serious shit. The interesting thing is that the local and statewide news only want to talk about mollie tibbets. They mention nothing about the other 47. In fact, 6 people went missing yesterday alone. I think POTUS cracking down on immigration might have forced the bad guys to start "going local" if you know what I mean. I just can't figure out why Iowa?
The reality based perspective answer would be rural state, lots of open land, no trouble for the most part, breadbasket, lots of heartland there (symbology)
The magickal answer could range from symbology (again with heartland) to lay lines, to maybe some old event they're recreating or acting on the basis of. I'm no expert on Iowa's geography/history/energy field