I think the big difference is that we are distanced from death. We even have smaller faamilies now because we accept that we can, by and large, not lose children during childhood.
Even my parents wartime generation rather expected to lose children, and ceratinly relatives, at some untimely point. I suspect nowaday most people do NOT know of a loved one snatched from them early on, and if they do it's unfair and nasty and how can God allow this.
Go back a hundred years or more and we knew that death was simply there, all the time.
So now if I sail I take ultra care and I am cautious because I know I can cheat death to some extent, so I don't tempt fate. I look after my children, possibly limiting their experiences to those where I can not tempt the fates.
If this ability to extend our lives is softer than my forebears, then guilty as charged...but I think they'd have done exactly the same in my shoes.
The further we get from frequent death the more it worries us, I think. Incidentally, I think the same is true of guns...but thats another story!