Imagine a muck-spreader.
The muck-spreader is switched on and projects splats of muck in every direction.
That is what the resentment-producing mechanism does. It splats out resentment in every direction.
The purpose of Step Four is to examine and understand the mechanism that is producing the resentment, so that the cause, not just the symptom, can be dealt with. It's no good just cataloguing the splats and calculating trajectories (first three columns.)
Certainly the splats have to be cleared up (top of page 67).
But, really, the focus must be on the mechanism. The mechanism can't simply be uninstalled, though. When it reactivates, it can certainly be deactivated promptly, and that's a skill that needs to be acquired. But the best thing to do is to stop feeding it material in the first place.
This happens by becoming literally disenchanted with the whole system, namely the fallacious reasoning that getting my own way is both possible and desirable, which stops me feeding muck into the muck-spreader to begin with. This is the thread that runs through the book from page 60 through to page 72.
If the mechanism is not fed with material, there is no muck for it to spread.
If I don't have a way, there is nothing for the world not to go.