Ban nuts for the common good? No way!
If you're allergic to nuts then don't eat them simple as that.
My pal's wife is allergic to man-made fibres. Want to ban everyone who's wearing artificial fibres too? Oh yeah - better ban the seat coverings on the A/C too in that case. Or use leather of course. But then what about the vegans? Okay, we'll use wooden seats. But no, the rainforest protesters will never wear it! Where do you stop?
I'm sure there are some genuine nut allergy sufferers and there probably always have been, but their cause has been hijacked in recent years by the "I need special care I do, and if i don't get it I'll sue you all" brigade.