He was probably referring to the 1848 revolution.
two German revolutions, one probably okay/good, while the other one was a total disaster for the entire humanity. with this in mind, I'd probably argue that revolution is bad in general.
I do agree that it is always good for some political speculators.
You tell me how Nazi could possibly raise to the very top without the help of that very beneficial revolution? maybe time to read more history books and come back with better trolling skills?