the 'you are so selfish' line takes away any credence from the argument
we all have to do what is right for our own families, and insulting those who don;t agree, is missing the point
the fact that the person who explained it to their child had to spend time reassuring her and giving her comfort, surely points to it being inappropriate to disucss with a small child, who does not have the intellectual capacity to process this, and understand the rarity of the event