Should the Jews have accept Jesus as Messiah or did they have an excuse not to accept Hm?

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To rashly claim that The Jews are to be understood as having been perplexed about who the Messias was or unsure of who He would be is to exonerate them for their perfidy and to indict God for not having sufficiently prepared His people to receive His Son as Messias.

Here is the catechism striving diligently to partially exonerate the Jews:

589 Jesus gave scandal above all when he identified his merciful conduct toward sinners with God's own attitude toward them.367 He went so far as to hint that by sharing the table of sinners he was admitting them to the messianic banquet.368 But it was most especially by forgiving sins that Jesus placed the religious authorities ofIsrael on the horns of a dilemma. Were they not entitled to demand in consternation, "Who can forgive sins but God alone?"369 By forgiving sins Jesus either is blaspheming as a man who made himself God's equal, or is speaking the truth and his person really does make present and reveal God's name.370