Just anecdotally I have noticed that I've been getting tailgated a lot more in the last couple of years. Just the other day I was doing 70 in a 55 MPH zone only to have an SUV zoom up and then swerve around me doing what must have been 90.
It's as if certain group has learned to drive by driving as fast as possible until they reach a hurdle, then tailgating that hurdle until they go faster or get out of the way. Speed, speed limit and road conditions aren't a consideration; only this asshole that's in my way.