Judas tries to undo his deal with the rulers when he sees Jesus is headed for death. He drops the money and commits suicide. The Jews accuse Jesus before Pilate and pressure him through a hostile crowd to kill Jesus. They would rather have Barabbas on the loose (probably an insurrectionist against Rome AND their Sadducee allies) than Jesus.
Sins this reveals
We will go to great lengths to keep Jesus at a distance, when we pursue sin. We're willing to live with a lot of known evils and dangers in our lives instead of forsake sin and submit to Jesus' reign.