The Principle of Humanity state that one should "always treat a human being (yourself included) as an end, and never as a mere means." Kant outlines the importance and correlation of rationality and autonomy with this principle. The idea seems very logical and well written, as it does not seem to be weak to any contradictions of specific examples that would disprove or weaken it. However, the principles blatant opposition to paternalism seems like a very strong statement. On this topic the text states “the principle of humanity easily explains our outrage at paternalism. To be paternalistic is to assume the rights and privileges of a parent toward another adult . Paternalism has us limit the liberty of others, for their own good, against their will. It is treating autonomous individuals as children, as if we, and not they, were best suited to making the crucial decisions of their lives.” In theory this seems like a nobel and very fair outlook on paternalism, because it strives to treat people with respect and not in a condescending or patronizing way. However, are there any situations in which making important decisions for people, against their will, would actually end in the best outcome for that person? There seem to be a few examples in which, perhaps one might have some information that another person does not have and they therefore act for someone which results in a better end result.
Free will is not as many people suppose, just the ability to choose as you wish. It is the ability to understand our choices in light of the consequences they will accrue. In other words having rationale allows us to be autonomous in that our aims can be directed not toward goals but our understanding of those goals i.e. why we want those goals. Think of it like climbing a mountain we may not get to choose which mountain to climb but we can certainly choose how we climb that mountain the only reason we can do that is because we will understand the implications of those choices. A creature without rationale or autonomy like a heroin addict also cannot choose which mountain however he has also giving up his ability to choose how to climb the minute he took those drugs. The assumption that we are genuinely and autonomous is false however we can choose to be genuinely autonomous and we can choose to recognize our free will and our own agency.