My entire problem with this rule is not it's intent, or whether it is morally, financially, ethically, politically, or even emotionally right or wrong. I can't make those decisions because no one will produce the criteria they based this decision on.
I think you gave up too early. You've posted here more than almost anyone else, but
you only asked SFI once.
When we presented this issue at the Spring meeting, Lance put together a packet including the research he had done. Unfortunately, I no longer have my copy. (I think my own copy got mixed in with the handouts at the meeting and I gave it away.) Maybe you can contact your club's E-board member to see if they have a copy, or perhaps Lance can make the materials available.
It is that we are expected to believe our safety will be enhanced, our liability reduced, and our future brightened "without at least a little bit of hard evidence."
There is no evidence about the future; it hasn't happened yet.
Other people have more appropriately asked for evidence that aged belts contribute to damages in impacts. I'm not sure there will be much evidence, since all the racing organizations I know of don't allow the use of aged belts. Since so few people are running them, there's not much population to examine. There's also the problem of causality; there's not enough of a sample to make a general comparison, and there's no way to perform comparisons between a control and an experiment group because of the high variance in accident parameters. Further, there are no standards for investgiation, an organization to investigate incidents, and no mechanism for determining cause and effect. Some higher levels of racing have these features, but club racers don't.
"Nobody here has presented a shred of evidence to support the damaging claims they're making" that belts have lost their effectiveness after two years.
It's been repeatedly presented that the reduced strength of the belts is not the core issue. As
Scott explained, this is about risk management. Conference doesn't cerify belts, or any other safety equipment; we have the experts at SFI and FIA do it--along with Snell in the case of helmets.
The real problem is the concern of liability regarding loss which may be traced to the use of equipment against the recommendation of the certifying agency. Going against best practice in an established industry not only says that you know better than the experts in that industry, but implies that you're willing to accept the results of that decision.
The rule book is full of risk management issues: long pants in hot areas, paddock speed limits, and so on.
Our ability to properly manage our risk is something that helps us race continuously and affordably.