In the office work environment, there are many interacting forces, politics and pressures, both perceived and real that can create the right conditions for RSI.
As human beings we have to deal with the mental insecurity of spending time thinking of how others perceive us. This can become magnified significantly in the work environment where the perception of your manager can be an overwhelming factor in whether you get a good pay rise or not.
The office culture of being pressured into sitting at your desk all day is pervasive. If you are not at your desk you may be perceived as being less productive. Trying to factor in time for the resting of injuries, walking around or