The late advice columnist Claire Rayner, in her review of Melissa Holbrook Pierson's motorcycling book The Perfect Vehicle, admitted she was unable to review the book objectively, because nothing Pierson wrote could change her loathing of motorcycling that originated when she was a "hospital casualty [emergency room] nurse and spent so much time dealing with bikers who were scraped off the road like so much raspberry jam after accidents", so that she "became an implacable hater of the machine... The danger to which bikers constantly put themselves, however well-wrapped in their urban armour of studded leather, and however horrendously helmeted, seems to me a reason for banning the infernal machines. ...a smell of blood and smashed muscle and bone mixed with engine oil. That is what motor cycle means to me. And, I'm afraid, always will." However, Kevin Williams, a well-known UK-based advanced motorcycle instructor and rider skills advocate has said "Often the bare bones of facts are backloaded with a subjective, uninformed, emotive and ultimately prejudicial judgment: “they know the risk of riding a motorcycle, but they still choose to ride rather than use a much safer car”. For example, agony aunt Claire Rayner, in her review of Melissa Holbrook Pierson’s motorcycling book...". Some safety experts have advocated banning motorcycling altogether as being untenably dangerous. Hyperreflective self-disciplinary. This attitude to risk consists of self-criticism, constant vigilance, perpetual training and practice, and continual upgrading of safety equipment. It is sometimes a reaction to an epiphany. There are many examples of riding advice which enumerate strategies for avoiding danger while riding, but they de-emphasize the rider accepting inherent risk as part of riding, instead emphasizing the rider's agency, based on his education and practice, in determining whether he will crash or not, and the utility of the correct safety gear in whether or not he will be injured in a crash. David Edwards of Cycle World wrote, "Here's the thing: motorcycles are not dangerous," saying that if a rider has a license, attends riding schools, wears all the gear all the time (ATGATT), and develops an accident avoidance sixth sense, motorcycling can become safe; "... do all of these things, become really serious about your roadcraft, and you'll be so under-represented in accident statistics as to become almost bulletproof." Kevin Cameron, also in Cycle World wrote, "[J]udgment improves with use. The longer you ride, the safer your operation tends to become.