I don't even drive on freeways anymore, and it's becuase of drivers who follow too close. It's simply not safe.
Every last one of these drivers should have their licenses revoked permanently. Unfortunately, we allow huge numbers of unsafe drivers on the road in this country.
I'd estimate that between 2/3 and 3/4 of all drivers on the road are habitual tailgaters, and maybe 1/2 the drivers will cut other people off without room to spare. This is appallingly dangerous, and as I said before, they all need their licenses revoked permanently. Unfortunately we live in a country (the US) which tolerates reckless, negligent manslaughter if you do it in a car.