Two libertarian camps, why?

Rothbard is on fire in his article, Do You Hate the State?, where is urges libertarians to join forces in their fight against the State:

Many people have wondered: Why should there be any important political disputes between anarcho-capitalists and minarchists now? In this world of statism, where there is so much common ground, why can’t the two groups work in complete harmony until we shall have reached a Cobdenite world, after which we can air our disagreements? Why quarrel over courts, etc. now? The answer to this excellent question is that we could and would march hand-in-hand in this way if the minarchists were radicals, as they were from the birth of classical liberalism down to the 1940s. Give us back the antistatist radicals, and harmony would indeed reign triumphant within the movement.

By "radical", Rothbard means the following:

To the radical libertarian, we must take any and every opportunity to chop away at the State, whether it’s to reduce or abolish a tax, a budget appropriation, or a regulatory power. And the radical libertarian is insatiable in this appetite until the State has been abolished, or – for minarchists – dwindled down to a tiny, laissez-faire role.

I urge all libertarians to think about this. We have a lot of common ground, whether we are anarchists or minarchists. Let us join forces. A final remark: "If libertarians refuse to hold aloft the banner of the pure principle, of the ultimate goal, who will? The answer is no one, hence another major source of defection from the ranks in recent years has been the erroneous path of opportunism." (Rothbard, The Case for Radical Idealism)