Here is one example that showed me that you cannot trust (or at least blindly trust) the direction of the Society. I read about this example, and I printed the actual articles from the WT CDROM to be sure it was real, and it was true!
12/1/72 WT, page 734-736, Question From Readers - Says that Oral (and anal) sex among a married couple are serious wrongdoings and is a disfellowshippable offense.
Now imagine how many marital issues this created, and likely how many marriages were either broken up, or miserable. How many people got DF'd? Who knows. I've heard that this caused many problems...
Then the 2/15/78 WT, p30-32 QFR - Says that this policy is in "ABSENSE OF CLEAR SCRIPTUAL INSTRUCTION" and that it is not serious wrongdoing and not DF'able.
So the policy was in place, lives were disrupted or ruined, on something that has no scriptual backing.
There are many other examples where the Society created a policy then changed them later. You will see many in Crisis of Conscience. This taught me that I will NEVER blindly follow ANYTHING the Society says. If I or the family need blood, then we will. How horrible if a family member died due to refusing blood, and what if 5 years later a 'new light' says they are now ok because it's not 'eating' blood. I will never put my family at risk due to any WTS policies. There are way too many examples of ruined lived on policies that later were reversed.