Earlier quoted context omitted.
You forgot that Bavaria has still a travel warning advisory, due to incompatibilities with the German constitution and their police ordonances. https://www.lawblog.de/archives/2017/07/20/bayern-endloshaft... Rather move to one of the democratic german states, where the police cannot put you into prison forever, without trial.
Not trying to justify that law (and I'm not a fan of the Bavarian "one-party-state" either), but I want to mention that "the police" can't put you into prison forever - they need to get it reapproved every three months by a judge. Plus, if you're the kind of person this law targets (a suspected terrorist), you would be well advised not to move to the US either...
The persons affected by the law so far are normal citizens, certainly not terrorists.