At the time (before late 1980's), nobody knew that you could catch Aids or Hepatitis from infected blood products, although we did know enough to suspect that there might be a significant risk. Consequently, they should have taken extra precautions. The obvious one would have been to take blood only from healthy individuals and not from prisoners and drug addicts, and the other one was not too mix the blood from multiple individuals into the same product. Those mistakes are inexcusable.
The other issue is the way that the health service and governments covered up the problem once they knew about it. Not telling someone who they thought might have become infected was also inexcusable because that person may have gone on to infect other people. Both issues are a scandal.
These days, we know a lot more about infection risks from blood products so the exact same thing couldn't happen again.
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