You might study the word a bit more.
All Jews of that era were well aware that Messiach had to come from Judah. Specifically from the root of David (Netzerim, from which Nazereth is derived)
There were only three tribes represented in Judea at that time, Judah, Benjamin, and Levi. All of Benjamin and all of Levi knew from early childhood that Messiach would not come from their lineage.
Finally, Yeshua plainly declared that his kingdom was not of the Earthly relm.
The motivation to kill him came from those that knew in their hearts that he was who he claimed to be, and that his birth meant the end of their illegitimate clique’s reign of power. The Pharisees did know the scriptures by heart, there couldn’t have been any misunderstanding.
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I don’t think you can claim to know what “all Jews knew.”