Yep, there are lotsa inattentive drivers now. Texting & yakking on the phone only add to the problem. There are little defense against those dummies, other than keeping an extra eye on the cars around you, and stay well away from them.
Speaking of eyes, maybe I should think of installing multiple car cameras. One for each side? Sometimes, the 'body-motion' of the other car hints of potential trouble: excessive slow speed, long delay after light changed to green, swerving from side to side, and excessive braking.
As for tailgaters, I try to occasionally veer to the right side of the lane to allow the impatient dummy to pass, or to let him see the long line of brake lights ahead of me. I love to follow a truck, so that the tailgater sees that I can't go faster than the truck.