Jews did help liberate Jerusalem from Roman occupation. The son of the Babylonian Exilarch led a Jewish army to liberate Jerusalem. But they were an auxiliary force, not the ones who actually took the city. It was just easy to blame them exclusively, ignoring what the Persians did in other cities around the Eastern Roman Empire.
True, though they did collaborate with the Persians.
it is interesting to remember that in those times the Iranians were Jewish allies