Think about it this way: suppose you know someone who smokes a lot of weed at home in an illegal state, and their neighbor rats them out, and police discover an ounce in the person's house. That person goes to jail for a month and gets a felony. Who has been more unethical: the person who snitched for adversarial reasons, or the people in the justice system which did their job enforcing the rules given to them?
Once again, not a theologian.
I thought the idea is that everything is or at least was created by God, so that would include Sin. It's same as that "could God create a rock so heavy even He couldn't move it" paradox.
Anyway, to me the quote indicates Jesus's loyalty despite knowing the torture and death He's about to experience, as well as indicating Pontius Pilate's relative insignificance in the whole thing. As the parent says, PP is mostly a gear in the machine.
When the chief priests and the guards saw him they cried out, “Crucify him, crucify him!” Pilate said to them, “Take him yourselves and crucify him. I find no guilt in him.”
7 * The Jews answered, “We have a law, and according to that law he ought to die, because he made himself the Son of God.”
8 Now when Pilate heard this statement, he became even more afraid,
9 and went back into the praetorium and said to Jesus, “Where are you from?” Jesus did not answer him.
10 So Pilate said to him, “Do you not speak to me? Do you not know that I have power to release you and I have power to crucify you?”
11 Jesus answered [him], “You would have no power over me if it had not been given to you from above. For this reason the one who handed me over to you has the greater sin.”