Not everyone will have the same exact symptoms from eating the tainted peanut butter. Some will have relatively minor symptoms while others will have severe symptoms. No two people will react the same. It will depend on your age, your health when you are stricken, etc.
There is a difference between stomach flu and food poisoning. Most people are QUITE able to distinguish between the two.
For anyone who has gotten sick after eating the tainted peanut butter, this is no small matter. For those who have NOT eaten the offending product, seem to have a tendency to minimize the issue.
Companies such as ConAgra will and SHOULD take full responsibility. And should also make it easy for consumers to extract a refund at the very LEAST.
