I can't believe it's not illegal for them ride in packs like that anyways. In my experience, when they ride in packs they ride like douchebags who assume they own the road. Happens all the time out here during poker runs and such. Drunken idiots riding bar to bar, crossing lanes, pulling out in front of folks, etc. It's the large groups giving bikers a bad name.
I am extremely cautious when I am driving near a motorcycle, but for some reason when it's a large group it makes me nervous. They're so unpredictable. Just recently on route 13 out here I was was following 3 sports bikes, leaving a good 5 car distance between them and my car. We were all cruising 60mph. When out of no where a wild pack of 10-12 upper aged morons on their scooters decide to ride my ass and started passing me on blind corners. Then they started riding super close to the sport bikes and passing them, causing one to go over the white and damn near off the road.