You can complain to SCOTUS. It's their standard. A parking lot at night, with no open businesses and a vehicle leaving the lot is reasonable suspicion enough to warrant a stop. Remember reasonable suspicion is the level at which an officer suspects...not HAS probable cause that criminal activity MAY be afoot...not IS afoot.
You would also feel pretty shitty if you were the business owner and you knew the police let the burglar get away without stopping him/her. They would be the first to show up and complain why the cops don't do anything. It's a damned if you do, damned if you don't world we operate in. Navigating that line inevitably pisses someone off.
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It's funny how few people actually realize that a short detainment . . . which is what a traffic stop is . . . requires only reasonable suspicion and not probable cause.
Years ago, I had a DUI arrest that ended with a criminal conviction with no issues. When it went to a subsequent administrative hearing to see if the guy would lose his license, it was thrown out because they ruled I didn't have probable cause to make the stop. Point being, even the DMV bureaucrat types, who are not law judges, had a fundamental misunderstanding of the law.