What you call progress is censorship.
As Orwell said in 1984 book "ignorance is a strength", instead of coming to explain the context of a work, we prefer to censor it by yielding to the emotion and tyranny of the minority.
This is the problem of multicultural societies (this kind of problem does not affect a country like Japan or Eastern Europe), each small community ( jews, blacks, arab, gay...) will always feel oppressed and there is a victim race.