Final answer:
The excerpts provided offer insight into the multifaceted nature of crime, including financial fraud by figures like Michael Milken and Bernard Madoff, and individual acts of violence like Jean Gianini's murder. They emphasize both societal impact and individual motivations.
Step-by-step explanation:
The question you've asked pertains to infamous individuals whose actions in society have had significant impacts, particularly relating to crime. None of the excerpts provided directly answer the question about a presumed "investment genius" who was also a cold-blooded killer. However, these texts do illustrate the complexity of criminal behavior in different contexts, ranging from historical acts of cruelty, personal vendettas, financial frauds on Wall Street, and murderous acts committed by deranged individuals. This reflects on the darker aspects of human nature and the multifaceted phenomenon of crime.
For instance, Michael Milken was a Wall Street financier who earned significant wealth through commission-based deals, later convicted for violating federal laws. Bernard Madoff's infamous pyramid scheme defrauded investors of billions of dollars. Simpler criminal acts like that of Jean Gianini's murder of his teacher also illuminate the psychological aspects of criminality.
These narratives demonstrate the wide-reaching effects of crime, drawing parallels between power, psychological factors, and societal influence on individuals' actions.