Collapse of Lehman Brothers in 2008 financial crisis

I need a paper (2000 words and +) that outlines the reasons why the Fed and Treasury allowed Lehman Brothers to collapse whilst saving others like Freddie Mac, Fannie Mae, AIG etc.. All arguments should be supported by financial data (such as graphs etc). An executive summary also needs to be included at the beginning of the paper. The bibliography should be Harvard style. I have attached two files, 1 is a very brief and wage description of what the paper should be like, the 2nd is a paper I found that focuses on the same subject and can be used as rough inspiration. Please no plagiarism