Court argument against Capital punishment in Furman v. Georgia?

/in /by

What is the best argument of the opinion of Court argument against capital punishment in Furman v. Georgia? Why? What is the best argument of the opinion of the Court in Gregg v. Georgia? Why?

Of the three crimes committed in the capital punishment cases (Furman, Gregg, Kennedy), whose crime was the worst? Why? If you were a juror on the cases, whom (if any) would you vote to execute?