If by "credible news organization" you mean MSNBC, CNN, The Huffington Post or The Washington Times they are all liberal leaning news sources and often times choose not to report on incidents or news that is pro gun. Major news outlets are the most biased both left or right. The small Mom and Pop news outlets I find often report more facts without the slant.
I disagree, large media outlets need veiwership to sell product. Without viewship, they would cease to exist. If they lose credibilty then who would wish to tune into that. Small internet outlets have nothing to lose, they dont fact check nor do even wish to do so. Their intregity isnt on the line and so they can print whatever. This is a prime case. Dont get me wrong, the large media outlets do have a political agenda and Fox News and MSNBC are the worst.