Who can be held responsible in Florida for injuries or death to motorcycle operators and passengers?

Really, anyone who is at fault or negligent in causing an accident can be held responsible for death or injury to a motorcycle rider. For example, if someone's riding their motorcycle through an intersection, and a driver ran the red light right in front of them and caused the motorcycle rider to drop their bike and hit the road and cause significant injuries, they can make a claim against that at-fault driver. Or, if the motorcyclist is hit from the side, due again to someone say running a stop sign, they can bring a lawsuit against that driver. Or, if a car negligently merges into the motorcyclist's lane, then they can bring a claim against that at-fault driver. Really, against anyone who was negligent in causing an accident.