How come mass shootings weren't as publicize back then as it is now?
Easter Sunday massacre (1975) a man killed 11 members of his family
The Greensboro Massacre (1979) kkk members shot up a protest killing 5 and wounding 10 others (and it was all caught on camera by a news crew)
But these and many other killings, the news did not give it much coverage like they do today. When there's a mass killing that happens now, everybody knows about it in a single day. And the news media will give a detailed week special coverage.