From a purely legal perpsective, that's probably what he should do. If you commit a crime you should go through proper due process, especially if the crimes are as serious as murder.
But super heroes have danced around due process for years. 75% of the Kooky Quartet Avengers should have been in jail rather than hanging around Avengers mansion back in the day. Sam in particular probably would have strong feelings about giving these people a second chance. I wouldn't buy this from every hero, but I'd buy it from Sam.