Why did Jesus keep company with somebody who he knew would betray him? Why did he keep company if he knew that after his betrayal Judas is going to burn in hell forever? According to the divine comedy Judas is in the lowest layer of hell suffering the worst punishments all because Jesus accepted him as his Apostle.
The ''sacrifice'', is not like the temple sacrifices. That is what confuses people ,/imo/. Jesus ''sacrificed'' Himself by taking on sins, but notice that this does not redeem all sins, period. This means that the sacrifice is using the same 'word', /sacrifice/, but it doesn't mean that Jesus was opposed to the act. The act was deliberate, and this is also why Xianity was always a growing religion in Israel, so forth. In Islam, the 'sacrifice', or crucifixion, is said to have not occurred, you notice the similarity here? Ie, in Xianity, Jesu ascends after the crucifixion, and is even teaching after the crucifixion, so, we can infer that this is not a narrative that indicates a 'normal' sacrifice situation /like the Temple sacrifices. Hence the 'logic', of what Jesus did, is not in a situation where your op concept would 'make sense'.