this is not true. ignorance is predatory, humans are not. ignorance is also weak. what you described currently exists as "fruit" (inedible) of modern democracy. there has never been a large scale example of anarcho communism. we have never until now had the means of communication to achieve such. power is in community, and it only harms the "ill willed" to harm anyone else. the collective and individuals are perfectly able to defend themselves, if that ill presented. the saying goes: do no harm, but take no shit.
Discussion
What you describe is wishful thinking.
Long before anything that could be called "democracy", armed gangs declared themselves " government " over large territories, effectively enslaving the local population to exploit it, simply because it was a viable way to make a rather plush living.
That's the reason neither anarcho-communism nor even proper communism has ever existed anywhere at scale.
what you described, is 100% what we currently have going on right now.