The sentence that both of you want added is completely irrelevant to what anarchocapitalism is, and is dealt with in the body of the text. I'll give you an example via wikiprecedent: christianity. The lede does say that protestantism came from catholicism, just as the lede for anarchocapitalism says that it is an individualist anarchism form (parent). But the lede of christianity does not say (though it could with references) that the catholics did not consider protestants to be christian (and vice-versa). And given that historically western christianity was catholic only for a thousand years, we see the argument from antiquity attempt clearly fail.

As to what you misunderstand, Binksternet, it is due weight. I'll give another wikiprecedent: evolution. There is neither mention of creationism nor ID in the lede for evolution. At all. Period. But it is clearly significant enough to have been brought up in court in the US many times regarding the teaching of it and of ID. One would think, then, that it would get mentioned. But no, it's not. Why? Because it's irrelevant to what evolution is. Similarly, that some people view anarchocapitalism as not part of anarchism is irrelevant to the lede as well. -