Most points of contention are complex and there isn't a water tight argument one way or the other. Most people aren't very convincing in the best of circumstanc

Most points of contention are complex and there isn't a water tight argument one way or the other. Most people aren't very convincing in the best of circumstances. Thus, most people don't change their mind because they don't get presented a sufficiently good explanation that would move them from one not-water-tight position to another not water-tight-position.