It's not actually banned in Germany. Though I think the only edition you can buy here is annotated, which does seem like a good idea.

It was essentially banned via copyright for a long time. The only reason that it is available now is that 70 years have passed since the authors death.

It actually was forbidden in other countries. But that's not the point. I do not consider banning this particular book bad, nor on the wrong side of history. Do you?