This is one of those scary things that can happen, if you dare comment on the driving of people, operating motor vehicles. I'm glad the cyclist is safe and the driver may be headed to jail. I wonder if all the other pickup driving peoples image will be tarnished as much as the cycling community would be, if the it was the other way around(if the ax was in the other hand)? Where would I put an ax on my bike, anyways? If it was a cyclist, there would be TV expose's on how these crazy cyclist are endangering us all. Cyclists would asked for an explanation. "why all this cycle-hooliganism?".
It's not really surprising and a good reminder to be cautious with around the driving public.