It's really not about the politics, it's about the use of a remote rural range, and enforcement of the rules.
Leaving a gun on a bench while 300 yards away IS a problem. Anyone can and does pull in to take advantage of the situation. Thieves are getting bolder, a drive thru gun snatch is probably going to happen in the future. I have never left my firearm at rest in the shooting lane while putting up a target save in one specific circumstance, a range on an Army installation. There, it's organized, and yes, the lowest common denominator is the guideline. Oh well.
Secondly, when you conceal carry, the entire world is a hot range. That exists right up to the gate, and there is no reason to believe it stops there. Attempting to impose an artificial rule that inside the gate you can't carry is ludicrous.
Can accidents happen, yes. Do gun owners shoot the john, TV, or their bed mishandling firearms, the internet is full of it. We haven't accepted that the entire world be a cold range and lock up our firearms, have we? If you can't carry loaded on a range, it's contrary to the entire point of the 2A.
Since the club simply can't prohibit and prevent members from carrying during the week, if there is a concern over safety, then conduct that portion of firearms handling at one specific pistol range under your purvey. Otherwise, attempting to regulate behavior when there is no possible way to enforce it is only going to diminish the credibility of the club and make those decision makers who pass it look bad. It's like having speed limit signs on a stretch of road with no enforcement - soccer moms and teens alike laugh because there are no cops or radar. It just plays up making a feel good rule.
There is also the follow on responsibility - it might be better to step down as RSO if this passes. Once you present your view and explain it, a contrary decision by the members needs to consider the unintended consequence of not having an RSO at all. If they think they know better, then let them deal with finding another. Deliberately choosing to ignore the counsel of the subject matter expert should have consequences.
If that sounds too much, the situation I deal with daily is having the general public ask questions about diagnosing their automotive ills, then cutting me off in mid sentence because the explanation is over their head. So, the customer always being right, that's all they get - a smile and friendly acquiescence. They just shot themselves in the foot, who am I to argue with them? It's the same thing here, they are asking for a learned opinion, outright rejection of the answer should net the same - no further involvement. That road is their's to choose, and it's one fraught with the lessons you learned thru a proper course of education. If they don't respect or acknowledge that, so be it. Shake the dust off your feet and move on.
Having to go thru that learning curve themselves will help educate them where ignorance once prevailed. After a few of those life experiences, they start to listen. And their imposition of a cold range isn't going to change the nature of any incident that may follow. Just kick back and be a user, not an enforcer of an unreasonable policy. You don't want to be asked why you weren't spending every free moment in the week out there trying to prevent the incident that could happen regardless. The unreasonableness of considering a cold range goes directly to having the logic processes that will blame you regardless and hold you responsible for any mishap.