Final answer:
Kant's ethical framework is based on reason and the preservation of civilized life. Killing civilians, even based on collective responsibility, is considered immoral according to Kant. The morality of an action is determined by its adherence to perfect duties, not solely by its consequences or potential gain.
Step-by-step explanation:
Kant's ethical framework is based on the concept of reason and the idea that certain actions are universally considered wrong because they undermine civilized life. Kant describes perfect duties, which are obligations that all individuals have all the time. These duties include not killing, lying, stealing, and breaking promises. The justification for these duties lies in the fact that if everyone were to engage in these actions, it would lead to the collapse of society. Kant also distinguishes between intentions and consequences and emphasizes that the morality of an action is based on the intention behind it, rather than the result. In the context of your question about justifiability of killing civilians, Kant's framework would suggest that killing civilians is ultimately immoral, regardless of the collective responsibility they may bear, because it undermines the fundamental principle of not killing.
Furthermore, Kant differentiates between perfect duties, which are universally obligatory, and imperfect duties, which are more subjective and context-dependent. While it is important to consider the circumstances and potential harm caused by actions, Kant argues that the morality of an action cannot be solely based on its consequences or the potential gain. For example, the sunk costs of moral decisions, such as evaluating the cost of war over time, should not solely determine the justification of the action. Instead, the morality of an action should be determined by its adherence to the principles of reason and the preservation of civilized life.
In conclusion, Kant's ethical framework emphasizes the importance of reason and the preservation of civilized life. Killing civilians, even based on a sense of collective responsibility, would be considered immoral according to Kant's principles. The morality of an action is determined by its adherence to perfect duties, not solely by its consequences or the potential gain. Evaluating the justifiability of moral decisions requires considering the underlying principles and the overall impact on society.