@WC - Despite your comfort with them, close passes are objectively dangerous. As cyclists we've all deviated from a straight line intentionally or unintentionally, and that deviation can be extraordinarily rapid and without warning compared to four wheel vehicles - we can "jink" in ways of which they can only dream! If that deviation occurs during a close pass, then we're in serious trouble...
So I think it's a case of playing the odds. Most close passes are thoughtless, or unknowing, and are likely to be executed by the majority of drivers (in my opinion!). Adopting a primary position prevents these close passes.
Only a small percentage of drivers, when presented with a cyclist in primary, will then use their vehicle as a (threatening) weapon. Again, in my opinion, but this is borne out by "news" where the novel gets airtime (road rage assualts), and by commentators (media or online) that confess to be "scared of cyclists" = scared of hitting a cyclist.
So again playing the odds - how many drivers are likely to be distracted, unaware of the hazard they're creating, or thoughtless compared to how many are likely to be sociopathic killers, the sort who would knife you for spilling their pint?
The old adage perhaps almost applies - never attribute to conspiracy what can be attributed to incompetence.
Robert