I have bounced through Acceptance a lot so there is backsliding involved and I guess it would be the same for other people (even if they path through things normally unlike yours truly).
like I'm in that stage right now but can feel that it won't take much to shoot me back into Anger (where I'm closer to atm) or Depression (which is never far away to begin with)
If self-possessed enough, I think people who feel helpless and powerless should get angry about it, but control the anger into clarity so you can use the energy to do things with. Even if it is just say "orly" to someone because it might make them think a bit XD