The danger with "be skeptical of all sources" is that it puts all the sources, including the trained scientists, the cranks, and the corporate shills trying to

The danger with "be skeptical of all sources" is that it puts all the sources, including the trained scientists, the cranks, and the corporate shills trying to spin things their way on the same level. They wind up saying what everyone says, mixing in the good arguments with the bad ones, and saying "we'll have to leave it at that". One thing that can help is figuring out peoples' financial motivations. To paraphrase Upton Sinclair, whose salary is depending on not understanding something?