My very first suspect as a detective drove to a Wal-mart in a different county and robbed a guy in the parking lot of his newly purchased .270 rifle and accouterments then drove back to our county for his planned shootout with the police (which he didn't actually engage in). This was a guy who was setting fire to houses then shooting the occupants as they ran out in a targeted "you owed me money and didn't pay me" message sending campaign.