I saw a recent stat (and how they arrive at these things is worthy of an investigation on its own): driving while texting is equivalent in danger to a driver who's reached the legal blood-alcohol level. (Now, of course, this varies from jurisdiction to jurisdiction - natch!)
A texting driver is asking for trouble. And if it arrives it's likely other drivers - who had and used their brains - will be involved. It's a self-centred, stupid thing to do but like cellphone use - which is rampant while driving in this area - how are you to contain it unless there's a law? Appealling to common sense ain't working. Because it is, like they say, uncommon.