Final answer:
The principle of justice requires treating all patients fairly and equitably in healthcare.
Step-by-step explanation:
The ethical principle that requires us to treat all patients fairly and equitably is the principle of justice. The principle of justice insists that the distribution and practice of healthcare should be equitable or fair. In clinical settings, it means that all patients should be treated similarly in relevant circumstances. In research trials, it means that all participants should be treated fairly and equally. The principle of justice ensures that no special treatment is given to specific individuals and promotes impartiality in healthcare.