People at Bonn protesting against Nazi cunts singing Ode to Joy
If you had to boil down, the german constitution into one short sentence, it would be ‘Never again’.
So displaying the german flag at such an occasion, is acually one of the few occasions where it is appropriate to use it in an political context IMHO.
And as a bonus point it gives nazis a taste of there own medicine, by taking symbols & language used by the opposition for your own movement. But in an non-stupid way this time.