Two concepts are misunderstood, leading to confusion, contradiction, and dysfunction when applying professionalism (P) and loyalty (L). Assumptions and impermanence.
Both P and L are based on assumptions, which change over time. If you cling to obsolete assumptions to justify your loyalty, you are heading for martyrdom.
Professionals may be considered fickle not loyal if they don’t articulate their assumptions for taking on and leaving an assignment. There is a fine line between a rat deserting a sinking ship and a prudent exit from a lost cause. Very few situations call for arguing with impermanence and clinging to misguided loyalty.