Original sentence: Critics argue that such theories are simply propaganda; false ideological justifications for racism, the Holocaust, slavery, apartheid, and colonialism.Scientific racism is a term which describes the use of ostensibly scientific methods to support or validate racist attitudes and worldviews
Edited sentence: Critics argue that such theories are actually propaganda that are false ideological justifications for racism, the Holocaust, slavery, apartheid, and colonialism.Scientific racism is a term which describes racist worldviews from a pseudo-scientific, or social darwinist, viewpoint and has no scientific validity