It isn't, but USSR doesn't represent such vigorous and wrong thoughts and expressions and opinions and what not.
Most people only associate USSR with communism, many also support communism.
What they don't know can't hurt them?
I wouldn't mind wearing a red shirt, the scythe hammer and star on the right breast, big yellow USSR on the front.
I also much rather wear that then the national socialist shirt.
- forgive any mistake made, I can't think nor type at 11:20 pm -