I haven't looked at your link, just as a disclaimer.
This is the thing though, this happens millions of times a year. People protect themselves, and they protect others. That isn't nearly as sensational for news as 'XX children murdered!'.
For example, one college student was hanging out with 7 other friends. Two guys in masks with guns broke into their apartment, herded everyone together, and stole all their valuables. Then they pulled out some duct tape and said they were going to tie everyone up, rape the girls, and then kill everyone.
This student had a carry permit, but didn't want to risk gunfire over a robbery. When the situation escalated, he pulled his gun, and IIRC killed one of the intruders and wounded the other who ran away.
That's not nearly as good of a story for the media as '8 college students raped and murdered' would have been.