I actually agree with Hoppe.
If one desires to resolve conflicts peaceably by way of rational argument, then one must recognise some kind of basic self-ownership, i.e. a right to some individual control over one’s own body. If one does not care to resolve conflicts peaceably by way of rational argument, then one probably isn’t interested in ethics at all – argument would be futile; rights to self-ownership irrelevant. At least, this is what I think Hoppe is saying. Hard to tell sometimes.
I am not so sure about some of Hoppe’s “deductions” from this principle, however.