ahhh you must remember it was a sign of spiritual deliverance but I have talked to someone who is jewish and ask them about this this prophecie happen 700 years before jesus was born so it was already fulfilled and you are so right he did not protected his people from the romans not even close, was never called Emmanuel but no mater how you try to show someone this you will never get them to see.

"If you leave the Christian Bible outside, eventually the wind and the rain
will destroy it. My bible IS the wind and the rain."
This quote is attributed to an unnamed Native American woman