Oh, holy shit!
Never mind my previous update just now. Things have developed with a sudden bang.
I still have no idea how this will play out, but the latest development seems to fit in well with Highsmith's other positions in this story. It's very cynical, but depending on which side of the characters your sympathies lie with, this could be interpreted in various ways.
For me, it's an observation of how some people condemn others for not sharing their view of morality while ignoring the threat that grows in their own backyard.
Like I said in my previous update, this is an unusual book in Highsmith's canon but I find it fascinating.