Complex issues don't fit in a 20 second sound bite on FOX. It's a matter of efficiency. If you go past 20 or 30 seconds people have to think about what they're being told. It's harder to manipulate your audience when you make them think.
Don't forget to mention the other news stations that all bend the news to fit their agenda/opinions as well. They all tell us what to think instead of presenting facts and letting us come to our own conclusions.