I also suspect that it may be a reaction to our some of what has been happening in our (comfortable western) world.
We have a weird disconnect where fictitious life is ever more violent (and yet safely distant) while real life is increasingly atomised and remote - and in some case, comfortable - from what can happen to others.
Different social classes live apart, their lives and life experiences rarely intersecting in a way that would not have been possible a century ago.
Kids grow up seeing thousands of - if not more - people killed in movies, video games, or in TV dramas, yet rarely get to see a corpse in 'real life' as it is considered necessary to protect them from viewing something which is so distressing.
I honestly doubt that someone would have collapsed from the sight of blood a century ago, even though there have always been individuals who found it an upsetting and unsettling sight; blood - from accidents, and blunders and everyday mishaps - was just too common a sight and experience.