I think the danger is equal with inattentive and aggressive driving. Like Kieth mentioned there are active and passive versions of both inattention and aggression. But all of these can lead to driver error and accidents.
Also, inattentive drivers is the number one reason why some cyclists I know will not willingly ride on roads, and only barely tolerate with white knuckles a bike lane. Aggressive drivers is number two on their list. As in, even if you could rid the world of the inattentive there would still be the aggressive and so they will never willingly ride on roads.