nowwhat?
You are right. God has not arranged any organization with absolute clarity that matches His messenger, hence God will not hold listeners like us blood-guilty. This is HIS assurance: "Again, if the trumpet does not sound a clear call, who will get ready for battle?" (1 Corinthians 14:8)
In addition, God knows everyone knows what is right and wrong [and it is not necessary to make people agree on this subject]. Hence preaching is unnecessary and it accomplishes nothing. For example, people are quick to notice the wrong when it is committed by others [which proves they know ‘what is wrong?’] and are quick to seek glory for the good when it is committed by them [which proves they know ‘what is right?’]. We all know what actions of others make us happy and unhappy which means we know what actions to be adopted and what actions to be avoided in relation to others. We have also an ocean of experiences (of our own and of others) to decide what is beneficial and harmful