It's not a "Mall Ninja thing".
And full tang is stronger, just take a look where the failure point is on the original Ka-Bars...right at the tang, where it goes into the handle.
You mean the part of the blade outside the handle, yes? That's where knives usually fail, full tang or otherwise. And there is no way that strengthening the tang can make the blade stronger there.
The Beckers aren't having that issue, even with the same steel.
Sigh. To the extent that this badly worded unverified claim is true (which isn't much - Beckers are actually unusually breakble for knives of their thickness, while Moras are at least averagely tough - see eg
http://www.knifetest.com/forum/showthread.php?t=1920) that's because the Beckers have thick BLADES. Not long tangs.
...Other blades not notable for failing this way are traditional samaurai swords, heavy bush hooks, and genuine Gurkha kurkris. All these have hard lives and are hidden tang.
More steel=more strength.
Yes.... But the steel HAS TO BE AT THE POINT OF FAILURE. You don't strengthen the blade by making the tang longer three or four inches away! In fact this belief is so silly I can't even understand where it got started. There's no justification for it in science or engineering. The stress that breaks the blade in the circumstances you describe is exterted by torque from the point of contact in cutting; how does lengthening the tang - on the opposite side of the point of failure - reduce torque or strengthen the blade at the failure point? It's like trying to fix a hole in a ship's hull by making the masts taller - it's insane.
...What often would help is a curved rather than sharp transition to the tang, but most production knife makers don't bother because it's not in Teh Book Of Mall Ninja, so their customers don't know to look for it, so they don't bother. You might want to read the wikipedia articles on stress fatigue and related subjects, if you actually want to understand this subject a little - there are several other characteristics that will badly weaken a blade that you also won't know about. (Hint: take a look at the picture of the blown Strider in the thread on BKRT suckiness.)
(Also: the original Kabars were rat-tail tangs - this design is nothing like the big hidden tangs on eg Moras!)