I said nothing about blame.
If you can't keep up then shut up.
Pilate found no fault with Jesus, and ultimately didn't make the decision, which is the significance of his 'washing his hands of it,' claiming no part in the death. According to Matthew, he thought the crowd would surely call for the release of Jesus not the nefarious Barrabas, but as foretold in the text, the Sanhedrin had already made the decision.
Matthew 27:1, 20-25
"Early in the morning, all the chief priests and the elders of the people came to the decision to put Jesus to death..."
"But the chief priests and the elders persuaded the crowd to ask for Barabbas and to have Jesus executed.
Which of the two do you want me to release to you?" asked the governor. "Barabbas," they answered.
What shall I do, then, with Jesus who is called Christ?" Pilate asked. They all answered, "Crucify him!"
Why? What crime has he committed?" asked Pilate. But they shouted all the louder, "Crucify him!"
When Pilate saw that he was getting nowhere, but that instead an uproar was starting, he took water and washed his hands in front of the crowd. "I am innocent of this man's blood," he said. "It is your responsibility!"
All the people answered, "Let his blood be on us and on our children!""