The death of Jesus was a historical necessity because it is something that frequently happens. It is natural for criminals to be persecuted and killed, even before. Also, death was not contained to such people. Those who got in the way of power, like Jesus did, also get killed. Jesus' path of radical fidelity to God got Him a lot of enemies who plotted against Him.
It was a prophetic necessity because prophets die for their faith. And Jesus, being the Son of God, is no exception. Prophets do God's will and announce hope for the poor thus their deaths are actually an expression of love, wherein God manifests Himself since God is love.
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