Eat peanut to avoid peanut allergy

There is a new comment in the BMJ about a Lords committee report

a number of recent epidemiological studies had indicated that early peanut consumption in countries such as Israel was associated with a low incidence of peanut allergy in the population. These observations had led many academics to say that exposing a child’s immune system to peanut allergen at an early age might result in tolerance.

It seems that allergen avoidance versus sportively exposure is a never ending story – forth and back and back and forth – and largely irrelevant as being only about the second line of defense?