Have you ever noticed that people who move into new roles also seem to undergo attitude changes? Of course those who notice such changes are often accused of being biased, especially when a former colleague gets promoted. And yet.... as Bob Sutton writes in his Blog-Entry, studies going back to 1956 have shown that a change in roles will often be accompanied by a change of attitudes.
The gist of the article is that reality distortion is normal and inevitable, "...the lesson is that we all need to be very careful of the roles we take and realize that they will probably change us more than we change them...". It is normal that people who take on leadership roles will identify more with their new colleagues and the company as a whole than they did in their earlier role.
But if nothing (or not much) can be done to prevent this, then what is the point?
Well, I suggest that leaders must remain aware of a few things:
first, that the phenomenon exists and yes, it will also affect them,
second: that points of view are not only influenced by personality, but also by roles - so even a basically 'good' person can develop views they might otherwise not have
and lastly: points of view and thus reality are not fixed, but determined to a good degree by the context in which we find ourselves - so..... there really is no good basis for 'my way or the highway' standpoints.