OK, well if you want to split legal hairs, technically it was the Romans who killed Jesus, it was just the Jews who turned Him over to them so He could be punished much more harshly than their laws would allow.
As for that verse you posted, He's not absolving the Jews who want Him dead of any guilt, He's saying that since He's the Son of God, he could very easily change the course of events, but He's choosing to fulfill the prophecies about Him.
Your right, Jesus didn't absolve anyone in that verse I quoted. He did it here:
"Luke 23:34
Jesus said, "Father, forgive them, for they do not know what they are doing."