So if there were no death penalty then trials would be shorter, there would be no appeals about unfair application, poor drug combinations and all the other issues. No court makes money from these cases. No lawyers are getting rich defending death penalty cases with rare exceptions, OJ, Dupont and a few others. The murder case which Scalia used to support that some crimes are so heinous that the application of death is needed, was just shown to be an innocent man sitting on death row for years. So if we had more rapid executions, an innocent would have been executed. Henry McCollum spent 30 years on death row before DNA exonerated him. Scalia has said that there is nothing unconstitutional about executing an innocent person!
Antonin Scalia Says Executing The Innocent Is Constitutional - Business Insider