Very sad stuff, but nonetheless I have zero interest in subsidizing your social preferences (either through regulation or litigation costs). Lots of people live good lives without going to restaurants all the time. Have a barbecue or something.
I can empathize with thinking that trade-offs that incur a high overhead might be super onerous to comply with, but simple information-based laws which just provide consumers with information that businesses already have on hand seems incredibly easy to comply with, no?
For example, in this case a "produced in a facility that handles sesame" label seems like it'd be a huge accommodation win without extremely minimal overhead for businesses.
But there are other food businesses the FDA inspects that aren't subject to the labeling requirements. For example, this could be a local wholesaler, like a producer of pastries that supplies area coffee shops. That wholesaler will have maybe brought a daily box full of muffins to the coffee shop, whose staff then moved them to a display case.
Those situations have no labeling requirements, and no matter how much information is shared by the producer, nor how often, the café staff as a whole can't be trusted to get it all correct. I don't say they "can't be trusted" because that's an unwise procedure—and it is that—I say it because my business may as well be that local pastry producer.
I hope society doesn't feel the same way about your needs when they inevitably arise
edit: reduced the tone.