I have found that "professionalism" is generally incompatible with honesty and integrity.
Professionals are judged on appearance and appearance of action: not on what they actually do and the consequences of their actions. Similarly, to act "professionally" often means to act against your personal beliefs, to suppress your emotion, to ignore empathy and to react coldly.
To be "business-like" is often to be cruel and socially irresponsible: that's "just business".
I would like to be judged by my demeanour rather than my appearance and on the consequence of my actions rather than my actions.