Crucifixion was a Roman form of execution, whereas the Jewish form was stoning. The Romans did not get involved with administering Jewish Law, plus the form of crucifixion used indicates a serious violation of Roman law..
And Roman Justice is infallible and perfect?
When the Roman magistrate like Pontius Pilate who is also the governor says a man is guilty, he is?
When the method of execution is crucifixion is imposed, a man is really guilty as charged?
Sure crucifixion in Roman Times is one of the methods. Burning alive was another favored form of execution, but perhaps the most shameful way to be executed for a Roman was to be crucified. Again, you would not suffer this punishment if you were a Roman citizen, which is why Apostle Paul was beheaded and Apostle Peter was crucified.
But going back to Pontius Pilate did he erred in his judgement?
Did Pontius Pilate exercise perfect judgement?
Let us look for answers in the bible not from anyone's personal opinion.
John 19:1-18; John 18:37-40 New International Version (NIV)
“You are a king, then!” said Pilate.
Jesus answered, “You say that I am a king. In fact, the reason I was born and came into the world is to testify to the truth. Everyone on the side of truth listens to me.”
“What is truth?” retorted Pilate. With this he went out again to the Jews gathered there and said,
“I find no basis for a charge against him. But it is your custom for me to release to you one prisoner at the time of the Passover. Do you want me to release ‘the king of the Jews’?”
They shouted back, “No, not him! Give us Barabbas!” Now Barabbas had taken part in an uprising.
Then Pilate took Jesus and had him flogged. The soldiers twisted together a crown of thorns and put it on his head. They clothed him in a purple robe and went up to him again and again, saying, “Hail, king of the Jews!” And they slapped him in the face.
Once more Pilate came out and said to the Jews gathered there, “
Look, I am bringing him out to you to let you know that I find no basis for a charge against him.” When Jesus came out wearing the crown of thorns and the purple robe, Pilate said to them, “Here is the man!”
As soon as the chief priests and their officials saw him, they shouted, “Crucify! Crucify!”
But Pilate answered,
“You take him and crucify him. As for me, I find no basis for a charge against him.”
The Jewish leaders insisted, “We have a law, and according to that law he must die, because he claimed to be the Son of God.”
When Pilate heard this,
he was even more afraid, and he went back inside the palace. “Where do you come from?” he asked Jesus, but Jesus gave him no answer. “Do you refuse to speak to me?” Pilate said. “Don’t you realize I have power either to free you or to crucify you?”
Jesus answered, “You would have no power over me if it were not given to you from above. Therefore the one who handed me over to you is guilty of a greater sin.”
From then on, Pilate tried to set Jesus free, but the Jewish leaders kept shouting, “If you let this man go, you are no friend of Caesar. Anyone who claims to be a king opposes Caesar.”
When Pilate heard this, he brought Jesus out and sat down on the judge’s seat at a place known as the Stone Pavement (which in Aramaic is Gabbatha). It was the day of Preparation of the Passover; it was about noon.
“Here is your king,” Pilate said to the Jews.
But they shouted, “Take him away! Take him away! Crucify him!”
“Shall I crucify your king?” Pilate asked.
“We have no king but Caesar,” the chief priests answered.
Finally Pilate handed him over to them to be crucified.
So the soldiers took charge of Jesus. Carrying his own cross, he went out to the place of the Skull (which in Aramaic is called Golgotha). There they crucified him, and with him two others—one on each side and Jesus in the middle.