Vesper, I am convinced that neither parasites or liver/gb are more important. I think along with the bowel, and perhaps even the kidneys, they are just part of a big system of filtration and digestion and enzyme production, etc. that needs to be treated as a whole.
I tend to focus more on parasites when they are shedding, but truthfully, it's just a question of focus for me. I do see them as destructive, but no more so than a congested liver/gb.
Also, while Miracle-Mineral-Supplement will kill most fungi, it won't kill at least one rare fungus. It brings up the issue of fungi though because they really are at the top of the food chain in the plasma. I use oil of cinnamon and occasional silver for the fungi, and I never eat mushrooms or yeasts, no matter how good them seem to be (microscopy of the plasma shows otherwise.)