> 4Chan's "Not your personal army" mentality vs. the widespread doxxing/"call their place of employment!" witch hunts

That's too generous. "Not your personal army" started because 4chan had a well-earned reputation for harassment - usually raiding other web sites, but often targeting individual people who caught their attention for one reason or another.

The "not your personal army" slogan came about because people who were very aware of this reputation were showing up, hoping to make a web site or person they disliked the next target. That got annoying fast, hence they told those people to go away.

It wasn't a moral stance against target harassment - far from it. It was a stance that the group mind will choose the next target when they feel like it - not because some rando is mad at their ex or something