The kids I see that have peanut allergies lived in bubbles. It seems like it is self-inflicted but I have no scientific evidence.
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He also had a grape allergy, and reaction was quite severe, but he seemed to outgrow that by his 40s.
At some points, some things are bad luck, at least until we truly understand the mechanisms and causations.
Even though we keep an epipen around and we make sure they're not eating peanuts, we don't practice strict avoidance anymore, we don't have to worry about the "processed on shared equipment" warnings, and there's no problem if he touches/inhales/eats peanut, meaning we can eat peanuts around him.