Because the math doesn't back up their words, which is frequently the case.
The authors don't state as fact information that they can't back up and, in general, seem willing to label claims as either credible or not.
She discovered the hard way that, while critics are more than happy to see successful sport stars pull outrageous publicity stunts, it all goes wrong when you're perceived to be a show-off who can't back it up with results.
And my thing is I want to help people so they don't end up back in the system and they don't have the resources and stuff like that.
Plenty of challenges remain: In Bridgeport, about a third of the streets were passable, but every road won't be opened back up before Sunday, said Mayor Bill Finch.
It was one of those things where the horse was going, and she went behind the tote board on the back side, and I didn't see it, and when the horses showed back up, she wasn't there.
"Being attractive or aesthetically appealing does give you a leg up, but if you don't have anything to back it up, nothing really materializes or comes from it, " he says.
According to Chad Kolton, a spokesman for the FBI's Terror Screening Center, there wasn't enough hard evidence to back up AbdulMutallab's father's fears, and so he wasn't placed on the terror list.
They haven't got any other back up of the hospital staff or anything like that when they're out there, they're on their own aren't they.
"We don't know why the switch failed and why the back-up didn't function as it should, " said Mr Lazaridis.
There isn't a lot of science to back up this path of treatment, though.
Several doctor friends said he needed surgery, but he didn't want anyone slicing up his back.
The chemical won't leach into water or climb back up the food chain to affect other species.
The problem is, I couldn't find credible economists who would back up the claims that you just made.
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"He didn't pull back at all and end up with a weak bill, " said Richard Aborn, president of the Citizens' Crime Commission, a nonprofit criminal-justice policy group.
Dowell Myers, a professor of urban planning and demography at the University of Southern California, said the state's growth has been a "roller coaster, " but he doesn't expect the ride to go back up in the future.
But I can't beat myself up over it, I've just come back and hadn't played a match since January.
You don't have to go down so far and you don't have to go all the way back up.
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"Transactions have bottomed out but I don't think that means prices will go back up, " said Michael Klibaner, head of research for China at Jones Lang LaSalle.
When a business can't use up its losses by carrying them back, it carries them forward instead, offsetting future taxable profits.
He stood up well, didn't back away from it, but had to fall back on simply denying that many people would pay more.
First-timers, as well as users that buy back into Up, won't find themselves fussing through clumsily sorted menus or contending with unnecessary load times.
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''He came flying back up because she wasn't there, '' McKinney said.
Once again, Panasonic were tight-lipped on when we might see this, and for how much, but don't be surprised if you see this pop back up some time around summer.
Jobs didn't often pick up the phone to go back and forth with customers, but at least one Apple customer, Scott Steckley, recalls a time when an e-mail to Jobs, explaining how there seemed to be no end in sight to his wait for a computer repair, was met with a phone call.
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