The Gemara was written under the rule of the Parthians, a constant enemy of the Romans. They would have been more than glad to see all the anti-Roman messages in the Gemara. So that one makes even less sense. Are you oblivious to the countless anti-Roman statements of Chazal?
But it actually makes no sense to me to celebrate an unsuccesful revolution. What exactly are you celebrating, the fact that people desired to revolt?
What are the 400 benchfuls of Talmidim that came to Beis Medrash when Rebbe Gamliel left? Are they also soldiers?