It's only relevant when making policy decisions about that particular rule. Regulations aren't commodities, and the fact that eliminating a certain regulation would destabilize the system is no evidence that removing any other regulation would do the same.

But in any case, if you think what would happen by abolishing all regulation is irrelevant to the real world, then you should be replying to RivieraKid, who was the one drawing such irrelevant (and, in my opinion, unsupported) conclusions.