Very true, SP, but it's been proven that accidents, terrible accidents, can happen even to very responsible owners.
We hope these things do not ever happen, we screen, and we educate our puppy buyers as best we can, and plan to become longtime friends with each of them. Sometimes unforeseen situations can crop up, although thankfully, bite incidents with Rotties are on the decline because of the recent precipitous (thank you *od) drop in Rottweiler registrations.
At one point in the mid 90s there were over 10,000 (yes, ten THOUSAND) Rottweiler puppies being registered every MONTH with the AKC. When you have these sorts of STAGGERING numbers being produced, you are statistically going to see every option that genetic profile can offer you, good and bad.
We hope numbers keep falling, I would love to see us out of the top 20 in the next 5 years.