"Life actually works like this: We are all free to do whatever we want. Seriously. We can do whatever we want, within the bounds of the physical world of course."

Although I perceive that what you state there is true, we should not confuse "can" with "may". "We can do whatever we want, within the bounds of the physical world of course" but we "may" only do what the [sic] laws permit.

MAY , verb aux; pret.might. ...3. To have moral power; to have liberty, leave, license or permission; to be permitted; to be allowed. A man may do what the laws permit. - Webster's 1828 American Dictionary of the English Language

Natural liberty, consists in the power of acting as one thinks fit, without any restraint or control, except from the laws of nature [See below]. It is a state of exemption from the control of others, and from positive laws and the institutions of social life. This liberty is abridged by the establishment of government.(Ibid.)

Law of nature, is a rule of conduct arising out of the natural relations of human beings established by the Creator, and existing prior to any positive precept. Thus it is a law of nature, that one man should not injure another, and murder and fraud would be crimes, independent of any prohibition from a supreme power. - (Ibid.)