I think you're being overly synical. A lot of it is about enforcibility because it has to be. Everyone including the autorities have limited resources. Speeding and using a phone is pretty black and white. If i got caught doing either, i'd take it on the chin.

Agreed that the parked in the car case re the mobiles needs good judgement on behalf of the officer. The law simply states keys in ignition as it does for drink driving, which makes it much easier to enforce. Otherwise the term parked or stationary could be up for interpretation.

Rick