Remember, most of those who came out of Egypt did not make it into the Promised Land. Many in Israel rebelled against Moses in his day. It is no surprise that many, often those in power, rejected the Messiah when he came. Yet the faithful remnant among Israel believed and took the message of God's love through the Messiah to the known world of that day. Though many thought the Messiah was suffering for his own sin, what was actually going on was that God was providing atonement for us.
Human nature is corrupt.
We all go astray and wander from the Good shepherd. We all have guilt and sin. The prophet Isaiah confessed that he was among those who needed healing and payment for our sins. And they made his grave with the wicked and with a rich man in his death, although he had done no violence, and there was no deceit in his mouth. The servant willingly accepts his suffering and death.