In most of the cases where I have seen this, the employees are at a severe disadvantage in knowing why certain decisions were made. Communication - and most importantly the lack thereof - is critical to Analytical personalities which commonly provide the bulk of IT services. In the places where I have seen a lack in faith in the IT manager, it was where the IT manager never bothered to explain why certain major decisions were made to the staff, undermining the manager's credibility and trust in the eyes of the staff. I realize that there are some things where you can't discuss details, but the simple act of having the discussion goes a long way towards establishing bridges and loyalty.