The East European victims of the Holocaust became the enemy under the banner of Communism, and the contradiction between the "resistance" to Communism also participating in the Holocaust had to be resolved in various ways such as double genocide and minimizing the victims. Same with China to an extent, as Japan became a US occupied outpost in Asia.
Zionism was also an ongoing political movement and project since at least half a century back by that point, and one which was deliberately designed so that it had political and strategy utility for western imperialism, giving a country to the Roma would not give such utility to those nations and in some way you also have to then resolve the fact that one genocided diaspora was given a country and another genocided diaspora was given absolutely nothing.
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Damn it's crazy that China just pollutes like that for no reason.