In order to more accurately determine who is on our side without purity spiraling, we must use a combination of two much more reliable heuristics:
>1. Do they want to move in the general direction of freedom?
This is super simple. Regardless of how wrong their views are, we must judge people by their relative position on the statist/libertarian spectrum, not their absolute one. No one is perfect, we can nitpick at everything and anything, but that is childish and counterproductive. As long as they are moving towards more wealth and power to the individual and less to the state and those associated with it, that should be good enough. With this, we can make strategic alliances with groups that take us further to our goals, instead of compromising on 20 libertarian positions just to gain a few more leftists on our side, which is what the US Libertarian Party has been doing for years.
>2. Why are they actually libertarian?
This is the most fundamental libertarian interview question, and the correct answer doesn't really have anything to do with Rothbard or economics, but with the very soul of libertarianism - master morality, without it libertarianism simply won't have a reason to exist. A true libertarian doesn't even have to know they are libertarian, but they are libertarian at heart because they value elitism, exclusivity, selfishness, competence, individualism, difference, the glorious, etc... and they can support libertarianism because they are chads who want to live among other chads, they will naturally produce freedom in society as a side-effect of badassness, even if they don't know any libertarian book, or are too low IQ to understand economics. This is all in contrast to fake libertarians, who produce communism as a side-effect of being wretched losers, despite having read all the right libertarian books, and memorized all the correct arguments to btfo leftards with facts and logic, but they themselves are leftists at heart, because they are driven by the primary leftist motivator - ressentiment, and its values: egalitarianism, inclusivity, altruism, democracy, collectivism, uniformity, the pitiful, etc... they either mistakenly presume that libertarianism is supposed to force these leftist ideals onto the rest of us uncivilized barbarians, or are knowingly sowing populations and organizations with slave morality to harvest socialism later on.