Blacks hell on slaving ships is not relevant to the hell faced in central and eastern europe during WWII
It is comparable in that it is a grievous error for them to obsess about the slave ships in this day and age.
So, too, it is a grievous error to continue to identify with the SS uniform, boots and insignia in this day and age, just because of an alliance of convenience against the Soviets back in the day. Only the symbolism remains. The alliance is over, and the actual SS is thankfully gone. There’s no need to associate with the uniform, etc. That was a necessity then, as homage to one enemy whose help was needed to push out and keep out another. Now, if you want to commemorate the Latvian home army’s defense against the Soviets, you can dress them in national costumes or some special hybrid uniform that’s uniquely Latvian.
Dressing up in the uniform of the SS is inherently pernicious, not only to Jews but also to Gypsies, Poles, etc. Your defense does not fly. At the time the Latvian home army had to wear a despicable uniform in order to obtain help from Germany defending their native land, but there is nothing Latvian about the uniform. Most likely the Waffen SS members themselves looked down on the Latvian SS as a bunch of provincial children dressing up like their cosmopolitan daddy. Would you similarly justify a group of Boston Irish wearing the KKK uniform if they were to say, “our chapter of the KKK was not involved in lynchings and cross burnings. We just were opposed to school busing and affirmative action.” The uniform that they are wearing on parade is illegal in Germany itself, and for good reason. It shouldn’t be celebrated in Latvia, either.
Dressign up as LatvianSS is not celebrating the killings committed by the Germans.