There are many foods I have an aversion (allergy) to but I never make a big deal about it at a restaurant. For example, I hate sour cream so when I get it as part of a dish, I just push it to the side and eat around it (other people I am dining with are welcome to scoop it up). Ditto for cole slaw, horseradish, sauerkraut and other smelly condiments that make me gag. No big deal, I just push all the undesirable stuff over to the side. I don't need to make big pronouncements to the waitstaff and demand that they prepare my dish special.
That said, I don't believe the fact that there are such sufferers should be able to use the power of the state to dictate how a restaurant open to the GENERAL PUBLIC cooks a meal; only that a restaurant should not purposefully misrepresent the presence of allergens with intent to cause a medical crisis. It is the stuff of murder mysteries like CSI to suspect that a murderer may have fed his victim peanuts unaware; but it can happen.