If you could indicate using Nazi symbols and calling to arms and self justice is free speech I would be happy to discuss further. I have a bit of a doubt that you grasp what the charge is.
I am unfamiliar with German law, so if you would like to educate me on the nuances of the charge, I would appreciate it.
There are BTW other "Äußerungsdelikte" (statement offenses, free translation), like slander and deformation. All these are based on the human right that no harm should be inflicted on you because somebody says something wrong about you (in a very simplistic way, you normally would have a lots of hours of law lectures just on this offenses, their reasoning and distinction).
https://en.wikipedia.org/wiki/Volksverhetzung
https://en.wikipedia.org/wiki/Strafgesetzbuch_section_86a
Specifics are hard to judge without the actual content and context of the posts, this stuff keeps courts busy.