Again as the new guy I have to refer to my other hobby of firearms as the TS hobby is still too new to me to have much to add. I collected WWII era rifles for a while. SMLEs, M1 Carbines, M1 Garands, K31s etc. I wanted a K98 Mauser but could not bear the thought of owning a rifle that took Allied lives or possibly killed innocent civilians in WWII. I ended up buying a K98 that had been refurbished by Yugoslavia after WWII. It seems a number of K98s were captured by the Yugoslavian resistance and used against the German occupiers. After the war the Yugoslavian government refurbed these rifles and decades latter they ended up on the market in America.
Reasoned that the K98 I was buying at least was used against the German forces and even if it took blood by German hands it was redeemed by it's use against them latter.
Most folks (and WWII firearm collectors) in the firearm world would think I was crazy for even caring, they are no more supporters of Nazis than me. They would collect whichever firearm they liked regardless of it's history. I do not collect WWII German TS items (just not currently interested in that era) but I do not think those who do are pro Nazi. I would support the ideal that a very small minority are pro Nazi just as a very small minority of folks buying WWII German firearm are pro Nazi.
I do on the other hand collect WWI German TS items
I would also add that WWII and it's aftermath have run it's course IMO and I bear no ill will towards modern Germany. They are no more responsible for the actions of the Nazis than modern Americans are for slavery or the actions against Native Americans. I would add that folks collecting U.S. Civil War items (TS and other types) from the Confederacy are not pro slavery or racist IMO, again a few are I am sure but the vast majority are just interested in that era.
Just my .02