Knowing that 'one is right' is one of the scariest philosophies in the world'. Knowing that one 'might' be right but might equally be wrong is a way towards undestanding the other point of view.
I think I'm right about an Avebury by-pass but then again I might be wrong and... ehm... isn't putting forward ones own ideas while at the same time listening to those of others the point of a forum such as this?