It’s indicative of the low intelligence of the officers if they cannot comprehend a very simple paradoxical bumper sticker.
Not only are they stupid, but they also display humorlessness and below average language skills since they took the sign literally. If English is their first language, they are very dumb indeed, to misunderstand such simple irony.
If English is their first language
This shows an alarming racis tendency on your part. While true that many Affrimative Action Appointees have a shaky grasp of English, pointing it out could also cause these armed LEOs who hold your life and that of your dog in their hands, a loss of self esteem. Pre-PTS could result, with the unwanted consequence of inappropriate behavior.
I hope you understand why I am taking your keyboard away.