The notion of a crucified Lord was deeply scandalous to the first-century world. The Jewish believers to whom our letter was first directed had been raised with the Old Testament teaching that death by crucifixion meant the one crucified was under the curse of God. This idea came from God Himself. And this curse was taken very seriously - Deuteronomy 21:22-23 - "And if a man has committed a crime punishable by death and he is put to death, and you hang him on a tree,  his body shall not remain all night on the tree, but you shall bury him the same day, for a hanged man is cursed by God.You shall not defile your land that the LORD your God is giving you for an inheritance."
These important words did not escape the notice of the Apostle Paul as he considered the staggering implications of the crucifixion of Jesus, the Christ - Galatians 3:13 - "Christ redeemed us from the curse of the law by becoming a curse for usfor it is written, 'Cursed is everyone who is hanged on a tree'...."
Make no mistake about it. This is why those soldiers would come around and break the legs of those hanging on the cross. Death had to come quickly because the Jews were devoutly serious about not "defiling the land" by breaking God's law and having that cursed victim hanging on the cross overnight. This was a religious act to the Jews. It was their obedience to God's command.
So you can see how the death of God the Son - the Messiah - on the cross of the curse would be seen as anything but "fitting." For these Jews - and for many today - the idea of a saving Messiah and a ruling Savior dying such a pathetic death on a cross makes no sense.