I was rather strongly against these early on, partially due to its tangential nature, and greatly due to fear over stuff like this - most of us, and most users we'll likely ever see here, aren't nutritionists, biologists, disease control specialists, physicians...
But I think Aaronaught made a good argument in the FAQ question: this is knowledge that is needed by most cooks. Allowing it means bad answers show up next to good ones and get down-voted (hopefully...) rather than as anecdotes in otherwise-unrelated questions (where they get missed by those who know better and end up doing real damage...)
Finally, common sense should tell you that if you get sick from someone you read on the 'Net, it's your own fault for blindly believing something you read on the 'Net without verifying it first.
Now, back to my frosty aged chicken-blood milkshake - tasty stuff, you should try it!