The arrogance I mention is kind of hard to explain. I DON'T mean snooty, stuck-up, know-it-all, think their superior kind of arrogance.
Rather it is something that we all suffer from I think, at various points in our life. Remember the arrogance of youth? There is also a certain arrogance that LBSs seem to fall into. (The WAS no doubt has their own arrogance of a much more problematic kind.) Anyway, it is just a way of being perhaps a bit too sure of ourselves and what we think we know of others.
It is no doubt hard to see in the midst of it, and hard for me to explain. But getting past it to a beginner's mind is a key to success, humility, and compassion.