Bloggers have mastered the art of using linking to accredit primary sources of information, and media outlets have found themselves resorting to similar techniques to stay in competition with each other.
Look no further than CNN.com or ESPN.com where several stories can be found that are directly attributed to other media outlets. Phrases like "The Boston Globe reports" or "Report:" have become commonplace waysto inform a consumer while bypassing credbility issues.
I believe such reporting is neither unethical or unjust. It is simply efficient. When an online consumer comes to your outlet for the latest information that they want to learn, you better get it to them any way you can. The online environment has heightened the competition of media immensely.
Also, the sooner you run the "facts" from a secondary source on your site the sooner you can begin investigating further. This allows you to speculate, give your audience possible implications, and drive content that takes the consumer's mind further into the story.
Getting the information from a secondary source down allows you to potentially keep the consumer on your site.