If you want, you can still buy a t'shirt with the picture of Mao Zedong on Amazon and other places. That's another mass murderer. Funny that nobody has any problem with that. Or you could get a Pol Pot and Khmer Rouge T'shirt. You want a t'shirt with hammer and sicle, no problem, even it stands for Soviet massmurder. You want a t'shirt of Stalin, no problem. You geht them everywhere.
Nobody would be asking the question "are you offended by..." I do have the impression that mostly leftists and communists are offended. But because all other massmurderer and signs of them are from extreme leftists and communists, they will not be offended by there own.