Why????

I must say first that I'm not a cop. But seeing you car blocking the road in the middle of nowhere looked suspicious. Yes you may have been minding your own buisness or you could have been waiting for an ilegal "drop". You were in the middle of nowhere! The cops were only doing their job in checking out what was going on. Cops are people and how you react and treat them will determine how they will act with you. I know there are always some A$$ ole's out there but overall they are just regular people.
BTW car looks nice and you were right the backdrop is great!!