I think the point here was that the excitable German with the Charlie Chaplin mustache in question did write his famous book in a German prison in the mid-1920s

I think the point here was that the excitable German with the Charlie Chaplin mustache in question did write his famous book in a German prison in the mid-1920s. Being jailed by your political opponents, whatever the reason, is generally unlikely to hurt your social status if you do get to power eventually, since even non-political charges can be dismissed as politically motivated.