I also think in todays time, news can become instantly spread across the country via 24 hour news channels. What might have happened say, 10 years ago would "old" news hours later unless it was considered important by the news director. Family violence might not compare to a Columbine story.
Also, with "Breaking" news stories, where you see something live from New York while you're in Seattle, is another factor. Again, 24 hour news needs stories to report.
I used to read a "print" newspaper, but now, flip on the internet, and stories are more widespead. Print stories that were buried on page 23 are today's instant headlines on the internet. If a violent act occurred today, it's instant news. Years ago, by the time the paper went to print is was old news.
Another thought relates to the Vietnam era. You might not hear or see anything from the battlefield fore weeks. Today, reporters are enbedded with the troups, and we see the reports "live" from the battlefield.
Is family violence more prevalent today, or do we just hear more of it because of the times?