With 100,000+ people in the 4 parks every day, the sheer number of people pretty accurately reflects that sometimes, people are going to die in the parks. I don't mean that morbidly but seriously, does anyone expect 100,000+ people to be perfectly healthy EVERY day.
I think relative to the general population, Disney parks deaths are pretty darn low. Heck, I'd even consider retiring to a Disney park to increase my longevity! LOL
Where did you read about a faulty platform causing problems or injury at Kali River Rapids? I'd like to see that one.
I don't recall anyone (a GUEST) ever being killed in WDW on a ride. Then again, I may have just not heard about it.