Disagree with candy idea because I just rather not have to deal with whether or not I want my child to have it. Candy bowl on x-ray, fine idea.
Offering candy probably only works now because it's not policy and only done by folks with the inclination who maybe can figure out when it's appropriate. It would be a disaster if implemented as policy. That might be a good suggestion for airports to implement- they could buy the candy and volunteers could hand it out.