I wonder how much of that is the evolution of the 24 hour news cycle.
I mean, “if it bleeds, it leads” has been the motto of news organizations forever- look at Weegee’s photography for newspapers.
The difference is that competition among news sources has increased dramatically since that era. In 1910, there were only newspapers. In 1940, there was radio, newsreels, and newspapers, in 1970, there were newspapers, radio, and TV. In 1990, there were newspapers, radios, TV, and 24-hour cable news. In 2010, there was all of that, AND internet news sites. And today, we’ve got all of the above, as well as things like X and other “instant” social media sites that compete with each other on the immediacy and luridity of their content. Newspapers and radio are getting murdered in terms of those, in fact.
So if there was a school shooting in 1915, someone who was in the immediate area would read about it in the newspaper- that day in a large metro area, the next in a smaller area, and even later in smaller markets. Word of mouth would probably get news around faster. In 1940, it might make the radio news in the local area, would be in the local newspaper, and might make national news somewhere deep within the newspaper. In 1970, it would make the local TV news, papers, and radio, and might make the national TV and radio news if it was big enough.
In 1990 it would have been much like 1970 except that CNN would have shown it much sooner, and it probably would have been breaking local news. And today we’d hear about it on X while it was happening, and we’ll hear about it non-stop on all the news outlets on the internet and broadcast media, regardless of where in the country you live.
To use a very immediate example, there was a mass shooting in Prague yesterday at a university. Had that happened in 1910, your average Dallas resident like myself would never have heard of it until about maybe 1990, if it made CNN. Even then, it would have been a one sentence mention. Now there are THREE mentions on the CNN main page about it - two stories and a “breaking news” banner. Same thing with the Icelandic volcanic eruptions- that’s something I’d have read about in a damn science book years later when I was a kid, but now it’s big news on national outlets.
I’m not convinced things are actually worse than they used to be. I am however convinced that our awareness of them is both more immediate and more negative than it used to be because of the news cycle and their competitive need to have the fastest, most lurid/sad/violent/shocking news.
Which after scrolling a bit is also what @LSLGuy is saying…