@Alex,
When it comes to interactions with the boys/gals in blue, it's true that most (not all) Police Officers do not meet the threshold of intelligent reasoning, are less civil, obnoxious. It's something to do with one of three things:
1. Their training - is normally very abusive and lacks respect. The instructors are beasts
2. Inferiority complex - most of them do not quite believe they are in a "job" like everyone else. They always feel belittled (their imagination, I think) and so try to be seen as "super-humans", just because they wield the force of law.
3. Society has made the officers of the Kenya Police seem like demi gods. Almost everyone (me excluded) approaches them with fear, which makes them feel like they are in the sky.
It would be great if everyone thought of them as their brothers/sisters, etc and demanded decorum from their behaviour.