Media loves the brutality. Im not agreeing or disagreeing, but your not getting too many youtube views filming an officer of the law giving you a warning for speeding.
How iften have you been pulled over joe? Im assuming, maybe incorrectly, lots if you intentionally have a gopro at reach to film an interaction.
Also, remember "probable cause" is very loosely worded.
If im an officer approaching your vehicle and i see you shuffling to find your gopro, that might be all I need to believe your concealing something or may be in voilation of a law(s).
Imo just be friendly and approachable. Nothing wrong with using your rights either.
Police can be stupid/violent or nice, as can your average person.