The GQ answer has already been covered – they use what’s available by deadline.
Without altogether straying into GD territory: There’s a line, however thin, between yellow journalism and simply producing interesting content. Every writer, journalist or otherwise, needs to write material interesting to an audience or they won’t be a writer much longer. Newspapers that continually miss the popularity mark don’t stay alive. Editors that routinely put boring stories on the front page drive down sales and don’t stay around. Sensationalism is thus a necessary vice of both the market and the medium. Where the line gets crossed is where the need for sensationalism overtakes accuracy and truth, and in so doing, the publication slides into the realm of entertainment instead of news.
With that limitation in mind, respectable news outfits try hard to juggle their need for viewers with their need for neutrality and objectivity. Exactly where on that line they fall depends on their organizational culture and their target audience. That’s why you see differences in coverage and reporting style between college papers, tabloids, USA Today, the Economist, single-purpose blogs, etc.
The thing is… we as modern consumers of information no longer need to be subject to those same limitations. Previous generations had no choice but to watch whatever was on TV or the local papers. We have no such excuse.
Today, you can and should tailor your news coverage to suit your own needs and standards of reporting. There is really no reason you can’t become an educated, informed consumer of news rather than a passive pair of eyes. Find some good sources and stick with them. Or, in Google News, it’s easy to adjust coverage by section, keyword, or source. If you don’t care about entertainment or sports, filter them out altogether, front pages and headlines be damned. If certain organizations continuously put out sub-quality work, decrease their prominence or block them altogether. Many mainstream US news outfits, especially televised ones, target an unintellectual popular audience; foreign entities like the BBC or Al Jazeera often have more sensible criteria for coverage of US events. Similarly, written news typically have more details and overall better quality because they’re written as a purpose-built piece, not as an adjunct to a rushed 30-second TV spot. Pay attention to the quality differences between publications and over time you get a much better front page tailored to your own needs. There are a thousand news and entertainment outfits all shouting their crap into space, but you only have to pay selective attention to a few of them. Cut the crap, filter the fluff, and focus on the things most important to you.