Some of the information in your post came from a study called The Causes of Fraud in the Financial Crisis of 2007 to 2009: Evidence from the Mortgage-Backed Securities Industry, which is a study of white collar criminogenesis. Not all of it does though - there is material added in. Where did you get it from?
I understand that you need to have evidence against individuals to prosecute indviduals. I also know that the evidential standared required in criminal cases is substantially higher than in civil cases, which are what the settlements relate to. Finally, I understand that it is a feature of a capitalist system is that it is the owners of capital who carry the risk associated with that. They are the owners of the company so of course they pick up the tab in terms of loss in the value of their capital and reduced or non-existent dividends. If you don't agree with that you presumably think that the shareholders at Carillion should have been compensated when that company went belly up?