1 When those who with cultish innocence hitch their wagons to what unknown to them is the pull of madmen or grifters and their wagons wind up in the ditch they tend to lose sense of what's sensible in their attempts to defend the indefensible conduct of those they've chosen to follow as they trade their collective moral compass for one as broken as an empty shell's hollow. Unable to swallow their pride and doped up sky-high on uncut cope and the often more-potent-still drug of denial — like so many fools hoping 'gainst hope — they tend to break the first rule of holes soon after their wagons hit the ol' ditch — as all such ill-hitched wagons must — when the grifters and loons who tow their rigs no longer elicit the once-implicit trust of so many suddenly ex-fellow-travellers. 2 Like the barb whose humble invention was doubtless inspired by a modest desire to simply prevent simple fishhook ejection the insurance policy of the long con is this: that even when they sense something amiss well-played marks — having heavily invested in expertly peddled con-job fantasies — are usually doomed to extend their losses by falling for the lure of the sunk cost fallacy.


"Unable to swallow their pride
and doped up sky-high on uncut cope
and the often more-potent-still drug of denial"
-- what a great summary of that familiar condition
A barb is a nice image for the way people can't go back. My neighbor is a 70+ lesbian who worked in public health (professor at Vassar) and who invested a lot in the civil rights movement and the AIDS crisis. She cannot imagine that the Democratic party has betrayed her and no longer stands for any of the values she held when she was young and hopeful. It's interesting to see her squirm when confronted with Palestine or the fact that public health now equals big pharma. She gets angry and, to go with your metaphor, works the barb in deeper.
I wonder if there is a literal solution to this problem that aligns with the metaphor. As my dad taught me while fishing, you have to push the hook further until it comes through the fish's face in order to get it out.
Maybe not. Her wife died "suddenly" from the shot, which makes it even harder to admit she has been wrong.