Most of those kids had uncles big brothers or even fathers killed in the second world war, so they knew first hand the effect of violence and death on the family.
Even allowing for those killed in George and Tony's little Eastern Adventure a death in the family is an alien concept.
Death is unreal to the kids of today, and it only ever seems to take place on a screen, even grandparents live longer, so they often don't encounter death in REAL life until they are quite grown up.
Too much fantasy not enough reality, that's' a big part of the problem.
Giok