First, The energy of a head on collision is twice that of a perpendicular collision. (+-, depends on mass and such). This also applies to car -> stationary car.

Second, one of the basic rules of the road is that you have to be able to stop within your sight distance.

Driver side offsets were a bad type of collision, and they were particularly bad in older body on frame cars before that sort of testing, and when there were a lot of 2 and three lane roads.