I know we all like to rail against Trump (who ain't a saint), but honestly, it's stuff like this that just simply doesn't help. The argument that he "called for violence" is not only uncharitable, it's also blatantly untrue. He was making a comparison to the "good old days" where monarchs could publicly execute officials that weren't in lockstep with their policies. Bannon's argument is moot (as we don't live in a monarchy), and he was just being hyperbolic.
Twitter and YouTube went off the rails and decided to ban him, which I do think is unfair. His polarizing domestic policy notwithstanding, Bannon was doing a pretty good job of keeping pressure on China with regard to the Hong Kong situation. He was a fairly regular guest on "dissident" HK news channels.