There seem to be good grounds for suggesting that professional neutrality is similarly ideal. But heart and mind both are usually too warm for this. We each view the world from an individual ethical positon. Indeed, in this respect, it is not surprising that some members of a profession will and others will not pick up a particular brief, or work for a particular client, even though they agree on the implications of the work. This is a situation well known in public enquiries.
None ever does so in evidence.
Pipers are paid merely to play their tunes. At least with such a profession as landscape architecture, it is difficult to see how an expert can be neutral with regard to the landscape - the environment, and its history. It is usually also his need. One can expect small fees for telling a client not to implement a proposal - which may be one reason why we have so many public enquiries. Two final quotations may help, not to clarify but to emphasise how complex this situation is.