A bad guy was shooting up a school. A couple of good guys took him down. How is it relevant to the story if they used their (presumably legal) personally-owned firearms, their bare hands, or a chunk of 2x4? Some papers choose to print that part. Others certainly choose to tell what the principals' ages, races and sexes were. Probably others mentioned that one (or more) of them were veterans. I expect there were some who elected not to run the story at all.

Three cheers for freedom of the press.