|Photo credit: NY Daily News|
It is a herd of little gangsters in full-face helmets on sport bikes. I don't know that the cager did not do something to provoke the riders, but drivers of cars and trucks do that all the time. If you are going to ride, you have to recognize and accept the risks.
There is nothing wrong with riding in a group if done with etiquette and a touch of good sense. As a motorcycle rider and the driver of a relatively tall F-150, it is sometimes difficult to keep track of smaller vehicles, especially ones just off the passenger-side rear tires. If they are able to accelerate and change positions as quickly as a sport bike, they can be in the danger zone before the driver knows it.
Personally, I enjoy seeing even swarms of sport bikes. Most of these guys are not going to harm anyone with their foolishness except themselves, and it is a generally innocuous exercise of testosterone-induced bravado. I used to do stuff like that on dirt bikes, and the crashes were part of the fun. Bragging rights come along with the bruises and scars. It is sad that sometimes these mistakes prove permanently damaging or even fatal, but danger is spice.