My daughter was at a party a while ago, she said she spotted some cookies, she knew were safe. She also said she didn't take any, because they where on a plate with some cookies that she was not sure about. She said she was worried about cross contamination.
She rationalized that it would have been better if I double checked the ingredients anyway, of the safe cookies, but did the cookies were very tempting to her.
We made cookies later that week, but I know my daughter will continue to make good allergy choices.