The self-defensive mechanisms established by the community I live in.
Anarchism doesn’t mean that humans can’t form societal structures. It just means that decisions are made bottom-up instead of top-down.
Hierarchical society doesn’t stop anyone with “higher rank” from claiming my house e.g. to build a highway or coal mine.
How would an anarchist society stop someone from claiming your house to build a highway or a coal mine? “The self-defensive mechanisms” is just police again you just call it differently and it can do whatever it likes.
No, the self-defense mechanisms aren’t the same thing as “police”, since the former is structured bottom-up and the other one is top-down.
An anarchist society would be organized democratically so that the people affected by policies have a say in these decitions proportional to howeit affects them.
So when you have 150 people in a society and 80 vote for people with red hair should be burned as witches what happens then?