The problem is that these larpers don't have handlers anymore and have a lot of guns.
In terms of "who cares," how about ordinary Ukrainian civilians being tortured and killed for their pro-Russian views? If that question was more general, in Russia, WW2 is a sacred war, because while most of Europe was fine with being back broken by the Third Reich, the Risshians simply didn't have that option.It was a war for survival. Kill or be killed, baby.
Also, the victory of the Soviet Union is one of the few things that unites the populace of Russia and most post-Soviet countries, so even from a pure Makiavellian point of view, an anti-nazi stance is reasonable.