You're right. I assumed you called 911, and I apologize for that. After re-reading your initial post, I see where you called the police department directly. But we all make assumptions from time to time, right? Just like you assumed the police have the authority to deal with a handicapped space blocked by a store display? A non-handicapped motor vehicle illegally parked in a marked handicapped parking spot would be a Police matter.
I don't know how else to tell you that this instance which you observed is not a Police matter, but rather a Civil/non-Police matter. I have backed up my responses with a cut and paste on enforcement action from the Americans with Disabilities Act. I explained how the Idaho transportation code you quoted deals with motor vehicles, not store displays. Let's pretend an officer showed up to your call. Who would he/she issue the ticket to? The store employee who was told by his manager to set up the display? The on duty day manager who received his instructions from the owner of the business or the franchise? The building owner or the name on the lease agreement? The franchise owner?
Police are bound by their authorities--may, shall, will are important words in traffic/penal code. It is unlawful for the Police to find a statute that is "close enough" to the perceived illegal activity you witnessed. Can you imagine if they tried to enforce this kind of Justice? Issuing a ticket in the instance you observed would be worthless without a statute governing the alleged illegal activity, as there is no legal backing to the civil offense you witnessed. It would be handled by the complainant in Civil Court.
And I never accused you of calling the Police "lazy." I was referring to the three pages of responses to your original post--many of which made inferred the "cops too fat and lazy to respond" theme.
I WILL accuse you of being stubborn, but that also comes with age. My stubborn streak appeared at an early age.