John Lennon's peace anthem "Imagine" can also be seen as an antidiversity hymn. Brian McLaren imagines something different.
Have you ever been in a conversation in which it seemed that you and another person were not talking about the same thing even though you were arguing about it strenuously? Something like that is going on in Mark. Jesus and the Pharisees are in conflict with one another but not necessarily about the same things and certainly not on the same terms.