Isaiah 53:4-5 is the crux: "he was pierced FOR our transgressions, crushed FOR our iniquities; the chastisement that brought us peace was UPON HIM." The word "chastisement" is ALWAYS affliction from God in the prophets. Isaiah 53:10 confirms: "it was the will of the LORD to crush him."

Anti-PSA reading of v.4: "We THOUGHT he was stricken by God, but really WE did it to him — God wasn't involved." Winger's response: v.4 says the crowd wrongly thought Jesus DESERVED his suffering (got what was coming to him). V.5 corrects this: he was pierced for OUR transgressions, not his own. The word "chastisement" (musar) in every prophetic occurrence (Isaiah 26:16, Jeremiah 2:30, 5:3, 7:28, 10:8, 17:23, 30:14, 32:33, 35:13, Ezekiel 5:15, Hosea 5:2, Zephaniah 3:2,7) is ALWAYS God bringing suffering as a result of sin. "The chastisement that brought us peace was upon him" — Israel had no peace ("no peace for the wicked" throughout Isaiah); Jesus bore their chastisement so they could have peace. Isaiah 53:10 seals it: "It was the will of the LORD to crush him" — same Hebrew word as "crushed for our iniquities" in v.5. God is the active agent.