Where a young adult defendant is found guilty of murder under the accountability theory and receives a de facto life sentence, the fact that he was found guilty under an accountability theory does not in itself raise proportionality concerns.The 1st District Appellate Court affirmed the decision of Cook County Associate Judge Steven J. Goebel.Ivan Sanchez and Michelle Davila were sitting in Sanchez’s car eating food from Wendy’s on Sept. 19, 2004, when he noticed a man creeping up on them. Sanchez tried to start the car …