While you may think so, the Greer police, who are investigating the incident clearly understand that Officer Hellfire's motivation for running the tag is relevant, since they are investigating the reason. If you don't get it, just think: Suppose he was mostly running the tags for blacks, with no other justification.
The difference is, we all understand from decades of "education" that blacks are protected, but you assume that Druids deserve no protection against being targeted for special enforcement actions.
We have too many special interest groups. As to 'why' that will remain unprovable unless the occifer volunteers it.