I never said it wasn't but there are different levels of dangerousness which you keep on saying doesn't exist. Someone who speeds by a few mile an hour is not as dangerous as someone that does double the speed limit. This is reflected by the penalties you receive when caught.
Read this, speeding is dangerous.
http://www.rospa.com/road-safety/advice/drivers/speed/inappropriate/
and this
http://www.who.int/violence_injury_prevention/publications/road_traffic/world_report/speed_en.pdf