[Menierofe]

Devil's advocate.

What % of organs later found to be problematic, are from people in these "threat groups"?

What % of people in the "threat groups" donate organs?

What % of total organ donations, are from those in the threat group?

How difficult it is to screen organs?

How much testing is required to screenthem?

What % of the organs slip through screening and testing, even though they are positive for some disease?

I doubt any of the above questions really work in favor towards the policy quoted in the OP though, though those are the only really justifiable reasons.