Becoming like Jesus

Why is it necessary for Jesus to become like us in everything?

"Therefore, it was necessary for him to be made in every respect like us, his brothers and sisters, so that he could be our merciful and faithful High Priest before God. Then he could offer a sacrifice that would take away the sins of the people." (Hebrews 2:17 NLT)

"For because He Himself [in His humanity] has suffered in being tempted (tested and tried), He is able [immediately] to run to the cry of (assist, relieve) those who are being tempted and tested and tried [and who therefore are being exposed to suffering]."
(Hebrews 2:18 AMP)

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