The Romans made plenty of trouble long before the Churban. They almost destroyed the Beis Hamikdosh many years before they actually did.
Just because Rebbe Yehuda mentioned a good point doesn’t mean he was “pro Roman”. There was nothing to be pro about. They were Machriv the Beis Hamikdash, and they had already crushed Bar Kochva’s revolution, that you celebrate.
Regardless, that whole conversation was in fact recorded, unsencored, in the Gemara. There is no reason to make up stories different than what Chazal told us.