I think the problem with this whole lightworker vs. darkworker subject is that, in the end, it it's very subjective. I remember Steve said in his earlier articles on this matter that the difference between the light and darkworker is who/what benefits, the whole body (lightworking) or the individual cell (darkworking).
The first problem that presents itself is this: Who is to decide who benefits? There isn't some objective entity that can say "this is benefiting the whole" or "this is ultimately only benefitting the single cell". And thus you regress into the religion kind of debate of right vs. wrong.
Another problem is the result vs. intentions. What determines what you are? Your wants/desires of result or your actual results? And who is to say you will be able to determine all of your results anyway? (What if Hitler killed some people that, if not dead, would've killed more than he was responsible for? An outlandish example to be sure, but one can never know.)
And what is the "whole" anyway? Is it the human race? Or is it the entire eco system? And who decides that? It clearly makes a difference. In one case saving a human could be considered lightworking, in the other, darkworking. We are, after all, killing the body, one could say.
Another point you could make is that if every cell was a great darkworking, that would help the whole as well. Survival of the fittest leads to fitter whole (if those that are unfit are let to die). And thus you could say that helping weaker cells actually is a diservice to the whole. You are putting some of your energy in weaker cells so that they energy levels equal out. You get to be average as a whole.
In the end, there are so many assumptions in this debate, it's almost impossible to agree on any of it.
I think the value in this whole matter is this:
Focusing your energy on a single point will increase your chances of a - in your eyes - favorable result. Be of single mind and purpose.
All the jibber-jabber besides that point is just that. Steve might feel great about himself because he thinks he's on the path of light, but some people might see his as a darkworker because he is trying to help people at all. Who is to say what is light and what is dark? Who is to say what is served?