What is it with American Christians and trying to link all evil to communism? . . .how about last year the Catholic church saying, "Yeah, our leaders did sexually abuse tens of thousands of people." Is molesting children bad?
Is it Christian dogma to sexually abuse children? No.
Have Catholics attempted to compensate victims for the abuse and to stop further abuse? Yes.
Has it been the official policy of the atheist government of China to elimate Tibetans as a culture? Yes.
Has that government self-corrected, apologized for mudering over 1 million Tibetans since 1959 and/or paid compensation? No.
Is building concentration camps bad? Is sterilizing people against thier will bad? Because all these have ALSO happened with the best of intentions by good Christians leading the charge against the sins of (insert the blank) - you want to know the great worry of 1912 Christians: black men dating white women - that's why in just over the last hundred years over 2,000 lynchings of black men have occured...by good Christian folk . . .
Once again, did Christians correct their errors and atone for their sins? Yes. Christians ended slavery. Christians ended Jim Crow. Hundreds of thousands paid with their lives.
Far as sterlization is concerned, you will find that was done in the 1930s not just by in Germany but by "progressives" in many countries including Denmark and Sweden. The eugenics movement had great support among late 19th century Harvard elites. The American Eugenics Society headquarters was two blocks from Yale's old campus. Darwin's cousin, Francis Galton started movement. Ernest Haeckel, Darwin's most vocal supporter on the continent, Galton and others were the intellectual grandfather of Margaret Sanger's "Negro Project" and the later programs in 1930s Germany.
It was hardly a "Christian" movement althought many Christians did subscribe to the need to cull certain people from the gene pool. Most opposition to it came from orthodox Christians however--G.K. Chesterton being one of the more prominent.
Aside from all that, there is no moral equilvalency between the lynchings of several thousand blacks by Christians in the Klan (lynchings which were sucessfully stopped by other Christians) and the systematic, as a matter of state policy, murder of over 30 million people by an atheistic regime in the USSR (over 100 million if you include atheist regimes in Asia). That regime never corrected itself. That ideology exists today in China's relationship with the people of Tibet, with the repression of Catholics, with the repression of the Falun gong and with the PRC's "One Child" Policy ("Better ten graves than one live birth" is one of the slogans of the atheist cadres in Bejiing.)
Btw...if you wish to find the remanents of the American eugenics movement of the 20th century in America today, you will not find it being propagated by Baptists or Catholics.
You will find it at Princeton University in courses taught by Peter Singer. You will find it in various progressive nonprofits which endorse euthanasia and abortion.