Community defense. It’s everyone’s responsibility to defend each other, not some centralized police force or military. Plus as others stated, societal change so people are less susceptible to that sort of “charm.” Most of the time people fall for warlords, crime bosses, etc cause they prey on those without. When you live in poverty, becoming a rank and file goon for a warlord doesn’t sound so bad. But if we built the economy to meet needs rather than profit, and society to give people freedom rather than hierarchy, people would be a lot harder to sway. What really could a warlord give people that they wouldn’t have already in an anarchist society? Money? What good would that do in a society that doesn’t use it. Power? Well the warlord has all the power, and an anarchist society already gives you full autonomy over yourself. The only thing they could offer is power over others, but in return you give up all your power over yourself to the warlord. Might be able to sway some people with that, but I don’t think it would be enough to become a serious threat. And like someone else said, our existing society can’t even defend against it. I’d say if this is really what is your make or break for anarchism, then I think you should reevaluate your priorities. You likely can’t make a perfect society, so we should be picking the one that meets our needs most. My needs are food, healthcare, housing, and freedom. Anarchism meets those needs better than our current society, and better than any other type of society currently or in the past.