Final answer:
Good moral principles are challenging to apply universally in public domain ethical decisions due to the complexity of real-world situations, lack of universal agreement on what constitutes good morals, diversity of individual values and societal needs, and the presence of competing interests.
Step-by-step explanation:
We can't use good moral principles for making ethical decisions in the public domain due to several challenges.
Firstly, the complexity of real-world situations often makes it difficult to discern our actual duties or apply universal moral principles consistently. The Golden Rule or the Principle of Utility may work in some cases, but not in others, like when ethically questionable actions (such as lying) may be justified to protect greater goods or avoid greater harms.
Secondly, Ethical Egoism (EE), which focuses on individual self-interest, lacks consistency and universalizability, making it difficult to resolve moral conflicts that arise in a multi-agent public domain.
Lastly, a deep understanding of shared values and the careful application of ethical frameworks that account for different stakeholders, including non-human entities, is needed to navigate the complex ethical landscape in fields like conservation and international relations. The diverse nature of society and interpersonal relationships means that one-size-fits-all moral judgments may not be applicable in every case, given the varying incentives and behaviors individuals possess.
Therefore, it is important for individuals and societies to articulate and agree upon common ethical principles that balance personal convictions with broader societal needs, aiming to minimize harm and promote the general welfare while respecting the diversity of moral views.