The way to lie properly is to fully believe the lie. If I choose to lie, I immediately accept that the lie is now truth and I forget what the prior truth was.
This is especially problematic when the group which provides the highest yield potential is further from ground truth because ground truth exerts a kind of gravity on all narratives.
The scapegoating threat is too high for my taste. I'm not well versed in scapegoat selection. Being too strongly tied to a narrative puts you in the crosshairs of the big guys if things don't pan out.
The problem with full narrative buy-in is that it's impossible to spin out of it later because you didn't plan ahead. Some positions are easy to spin out of while others are essentially impossible. Full narrative buy-in doesn't play well with position selection IMO.