What counts as "defending" personal property, and what's using violence to take other people's stuff depends on which property claims you consider legitimate. This in turn depends on how you justify the property claims. Leaving out the qualifier is a cop-out. If you leave out the qualifier, what is the justification? Why is your claim on it any better than mine, or your government's?

There are three possible answers to that:

* Desert: It's mine because I deserve it, having worked hard for it.

* Contractualism/Voluntarism/VoluntarYism or whatever you want to call it, the idea that the arrangement is fair because it was all voluntary from the involved parties.

* Tradition: It's mine because however I got it, now I have it, and you can't take it from me. I call this the "facts on the ground" argument. It's not really a moral argument, so if you take this approach you can't morally condemn people who challenge the status quo (want to take it from you). If you leave out a justification for property claims, you're really here by default.

These three answers are not compatible, for reasons explained at length.

It's not bullshit, because it's a clear argument that I can follow. Whether it applies to "real" libertarians is another matter - as far as I can see it does, though.