Because what is the point of only testing a good one, and not comparing it to a defective one? If you tested both, that would give everyone a true sense of "There are a lot of bad ones, but there are a lot of good ones too." More lead to throw at Apple to get them to fix the ones that ARE bad.
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Well duh, it's going to be fine if you are testing a non defective one.
Well no shit. Why would you use a defective one?
Because what is the point of only testing a good one, and not comparing it to a defective one? If you tested both, that would give everyone a true sense of "There are a lot of bad ones, but there are a lot of good ones too." More lead to throw at Apple to get them to fix the ones that ARE bad.