Esmay there will always be those who think that as the person isn't eating the nuts it is OK. It is not so much those with the allegy not thinking, but those that buy, give or use products on other people.
Our DGD had allergies, now mostly grown out of, but when young she was mildly allergic to tomatoes, so was never fed them, but then one day she found one and was holding it, not for very long, because it was quickly taken away from her, but it triggered a sudden and violent reaction, far more severe than when she was first fed them and reacted.
So, I am sorry, but people do need to be warned.