Everyone has competing ideas. There's no unanimous agreement on what "good" is. We don't all have enough knowledge to judge each idea purely on merit - a lot o

Everyone has competing ideas. There's no unanimous agreement on what "good" is. We don't all have enough knowledge to judge each idea purely on merit - a lot of the time our only way to judge is to see if the proposer really believes in it. So ideas have to be sold. I think this is the cause of lots of problems in the world - we cannot all be scientists, laywers, doctors, engineers etc and we have to make judgements about who to put our faith in.