The most extreme task that you'd do with a bushcraft knife is batoning wood. If you are batoning correctly, the baton is striking the spine of the blade of the knife - not the handle. So how exactly you could break a blade by batoning correctly... It's almost inconceivable.
Doc Smith
There are some images of the blades snapping in the middle that have been posted in links above. My guess is that there was a problem with the heat treat on those particular blades. Given that they are cranked out in enormous quantities, and cost very little comparatively, it is easy to see how every once in a while you would encounter a heat treat problem. That happens in knife runs put out by most companies right?
As far as breaking a rat tail tang due to batonning, it is conceivable that someone could get the blade well into a piece of wood and be putting a lot of force downward on the handle to counteract the tendency of the tip to point down and the handle to point up during batonning. By putting downward pressure on the handle while at the same time whacking on the spine of the knife, it is conceivable (at least to me) that you might have a problem.
As I stated above I haven't personally broken a Mora
per se. I have had LOTS of problems with rolled edges. I'm guessing the reason I haven't actually broken one yet is that I stopped using them relatively soon after I had problems with one in the jungle.
This is a Mora I brought down as a companion to a machete. You can see it posing very nicely with a jungle hooch that I built.
Here is where I had a problem:
What happened was I was batonning the knife through a small piece of wood (wrist sized) in order to split it up for a fire. The wood was really wet and I needed to get it split down to small pieces in order to get it to burn. Could I have used the machete to do it instead? Yeah. My mistake. Long story short, the Mora got halfway down the log and it flexed at the point shown. When I pulled it out the knife remained bent.
In all fairness to the Mora, I was probably asking it to do something that it wasn't built to accomplish. I wonder if we're asking the knife to do to much by slamming a piece of wood on the spine in order to force it through another piece of wood?
Is the knife in the photo "broken?" I guess it depends on who you ask. Do I trust it any longer? No.
The Scandi grind on a good Mora is an absolute joy to carve wood with and to do things like make feather sticks. Why does it have to be equivalent to knives with sturdier construction? The Mora is fantastic at what it was designed to do. It doesn't have to be the answer to every problem. It doesn't have to be a supertool.