Don,
You have had the opportunity to observe numerous approaches to "impugning" a subject, which ones work and which are counterproductive.
"A lengthy historical analysis shows that this crisis is the result of an erroneous interpretation of astronomical observations made exactly one century ago."
The "dark energy" crisis fits well within Georgina Parry's essay 1316, where she used the term "incomplete information", how this has resulted in some of the contemporary assumptions. If the scientific community or "scientific authority structure" (a Kuhn term) then decides an assumption is fixed in stone, everyone is required to use it without question.
There is another issue that has stagnated scientific progress for over 70 years, but one cannot challenge the views of a scientific "prophet" without retribution, thus it is better to "impugn" secondary issues.
I challenged a "cast in stone" assumption in my essay, 1294, and I quoted Kuhn when I presented an example of a contemporary paradigm change.
Very people are aware that the transverse electromagnetic field structure was the only structure known to Einstein when he developed his theories. Does this make a difference? Yes, Einstein had "incomplete information."