Think of it from the perspective of a news photographer - you're in a situation that is extremely dynamic and fluid, and events are unfolding in front of you at lightning pace. Your first and foremost concern is to get the image, and get it into the hands of your editor as fast as possible. Taking time to change lenses or move to a different vantage point to aesthetically improve an image in a way that 99.99% of your viewers will not be concerned about will cost you the shot. It also means hauling around that much more gear that slows you down, weighs you down, and makes you more of a target for thieves and/or enemy combatants who nowadays like to shoot journalists and EMTs as much as they do their enemies. A zoom lens it is, then. The journalist is not taking photos to appease your sense of aesthetics, they're taking it to convey information and to make money for themselves and their editors. When you can plan ahead for something, sure, by all means, use a normal prime lens, but when your back may be up against a wall (sometimes literally), you want an adaptable tool.