Since the requirement for a spotter came about after an event occurred, rather than banning the pilot from flying, doesn't that make it an accomodation? The club BOD and other officers have an obligation to to the club, the memberrs of the club, and the general community to ensure that hazardous conditions are eliminated. From what I've seen of my late neighbors events, the defibrillator could very easily cause the loss of control of an airplane in the air. The occurence of an event could be used in a law suit against the club and it's members if a future event resulted in personal injury or property damage or even death as knowing a potential safety issue was there and not taking action to relieve or eliminate it. By requiring a spotter, the club is protecting all members, and at the same time allowing the person to fully enjoy his hobby.
Always remember, that just because unsafe action in the past hasn't had any negative effects doesn't mean it isn't going to happen, it really and only means that it is getting ready to happen, and will eventually happen.
My company had the attitude that accidents happen when I first started working here, Lots of accidents from cuts requiring stitches through broken bones to at least a couple deaths. After a new president implemented the truth that most accidents are avoidable by reason and thinking, there has been only one death and only a few broken bones in a company of over 3000, in 18 years. We used to do worse than this in one year. And the one death was the result of a true accident. Very few true accidents happen. This accident was caused by a faiure of a worn component in a safety lock-out. Every other "Accident" was caused by someone's carelessness.