Even after this conversation has taken a hard left, I'm gonna speak up as a motorcycle rider:
Those motorcyclists deserved it. Boxing the SUV in, brake-checking it, then stopping and surrounding it?? I'd run them over if I was in a Prius! and if I was in that group (which I doubt will ever happen, since I don't do group rides) I would ride away. You can't stop a mob by yourself, but you can be not a part of the madness. Some might say they would stop it, but facing a mob by yourself...that takes a lot of courage and nobody knows until that moment.
I hope those riders get charged, and have to pay medical expenses for the driver and passengers, and I hope the Land Rover operator gets off. Guys like this give motorcycle riders a bad name.
Peace,
Greg