The injuries in this case (from San Diego) are fairly extreme; for example, the six-year old kid here was sent to school limping, with blood seeping through his jeans. That's not the result of your typical spanking with a belt.
The disposition of the case -- taking the children away from their parents -- nonetheless highlights the danger of imposing any non-trivial amount of corporal punishment on your children. Because courts in California (or, at a minimum, here in San Diego) are not particularly fond of the practice.
To say the least.
Even when the parents demonstrate progress and promise to never, ever do it again, they may still lose their kids.