I think you missed my point. I don't think random enforcement of the cell phone laws do that much good, as you say, drunk driving.I get what you are saying, but the public at large is so --- and how do I put this delicately --- dumb and selfish that I think they are really just trying to make it top of mind awareness in order to try and prevent someone getting hurt. Otherwise, if they don't make an issue out of it, many will assume that it is OK in the eyes of society. Some people will listen and others won't. Just like drunk driving. Everyone already knows that its not smart to do it, but some people do anyway. We have to keep reminding that latter group that its not a good idea.
I think as enforcement of the laws became stiffer people took notice. It wasn't that many years ago when local judges would give a first time offender a slap on the wrist and a wink, hey, he had to get his car home from the bar somehow. Now that the old slap on the wrist is cuffs and jail, people took notice. I also think that most decent establishments have their eye open and will get people a ride home.
The hard lesson might be the same with distracted driving. Don't focus on the phone, focus on the driver. It's their responsibility to maintain control of their vehicle at all times and to be aware of their surroundings.
Hell, I'd pull people over for impeding the flow of traffic when they are slowing down the flow of traffic, if they are on the phone, they get the daily double.
Run a red light, double the ticket, one for failure to stop, the other for distracted driving.
Penalize the offense.