I concur so completely I've argued that the two are separate conditions of the same concept. Liberty does not exist where I enjoy the option to lay my burdens off on you. That is a state where I am the tyrannt and you the subject. Likewise, a person cannot assume a responsibility without enjoying the liberty needed to carry it out. You can say I'm responsible for taking out the trash, but if you have me chained in the attic I cannot assume it.