/lit/ - Literature

>>13220286
Sorry for the late reply, I had to walk my dog. This is a good question, though Kant would refer to neccesity (that is, the neccesity to strive to be moral) as duty and it is probably the most contentious part of his entire system.

The reason that Kant gives for why every "rational" being has a duty to be moral (the CI) is due to their autonomy, AKA, Free will. Effectively, if, through the sensible world (phenomena) we are bound by causal determinism (every cause must have an effect) then there is no free will, but as Kant lays out in the CPR, through the intelligible world (Noumena) there exists a priori principles which require an agent to be able to act without prior governance of cause. Therefore, if one was, as Kant did, extrapolate morality from a purely intelligible standpoint (that is, through metaphysical intention, which is why it must be universal, for if there exists a moral maxim which is determined good a priori, it must be good in all situations) one would be able to conclude an objective morality which you are bound by your own autonomy to follow. In short, as Kant says, if free will exists as noumena, than it is the duty of the agent to follow a categorical imperative. this is perfectly analagous to how our experience and understanding relies on A priori categories to function, just in this case it is that for us to have free will or autonomy, there must also be an objective a priori moral category.

In terms of wether different logics could provide different axioms for the CI, I think Kant would say no, since as rational agents, we cannot know anything about noumenal reality, there cannot exist a logical system other than the one which we determine via transcendental methodology. I hope this helped answer your question, if you would like me to explain it more simply let me know, though it seems from your replies that you had read enough Kant to understand what I mean.

Pic related for when garbage naturalists like J.S Mill critiqued Kant for using weak utilitarian logic to derive his concept of absolute duty.