The problem is the new media model.
WAy back when, newspapers fact checked and double checked stories before going to print, which happened at the same time everyday.
Now in this era of 24 hour news channels and internet news sights and opinionated bloggers, being "fast and first" and getting the most clicks takes priority over accuracy. After all, the more clicks, the more advertising revenue. And news needs to be released as it happens when it happens.
The fact-checked corrections can come out later, in what I call the Microsoft Model, named after the way Microsoft intentionally releases faulty software in order to meet their scheduled date, and then just creates "patches" to fix the product later.
The danger in this new Microsoft Model is that in between the original story and the fact-checked version, there are far too many hits on the stories, and far too many eyes that have already been on too many internet discussions and rumors and forums and overall circulation, etc. And not everyone reads or believes the corrections in the wake of all the original versions proliferating around them. It's in this gray area between original version and fact-checked version that a lot of conspiracy theorists live...