Perps on scene - no arrests

What does it take to get the McHenry County Sheriff's Department to make arrests, when they respond to a breaking-and-entering call and find the perps still on the scene? Three men reportedly broke into Harmony Real Estate when it was closed and locked.

When the responsible party (RP) for a commercial office reports a break-in and, when a deputy shows up, the culprits are still on the scene, why would he not arrest them?

Is it really true that the deputy told the RP that he'd file a report and the RP could follow up later? The RP in this case should raise Hell with the Sheriff's Department and involve the Undersheriff and the Sheriff, personally; he should demand an explanation why the perps were not arrested.

And he should complain to the County Administrator and to the County Board. According to information I received, the perps had no authority to enter the building when it was locked and unoccupied. If they were in the building without authority, they were trespassing, at a minimum, and could be charged with burglary. I wonder what the deputy's excuse will be for handling the response as it was.