Others have done what whites did since immemorial times,blacks did it to other blacks, whites did it to other whites and so on, and so forth. The whole human history is full with tragedy, of inter tribal warfare, based on ethnicity, beliefs...you name it. There's nothing new in here, even chimpanzees do horrible stuff to other chimpanzees. Again, dividing it into whites vs the others is wrong, historical perspective is also a factor and many, many more.
You're grouping people again which I must underline that is a flawed way of thinking. I don't know what Romanians you've encountered but I never had a problem in stating who I am.
Grouping people together without undertaking a serious analysis leads to the creation of cults which require the destruction of those outside the cult....see the nazis, communists....and these cults kill millions and devastate societies.