The Pox of Multiculturalism
What the left calls "multiculturalism" is actually the systematic destruction of cultures and the replacement of these cultures by a synthetic, artificial, and meaningless global culture. When the left talks about "diversity," it really means the crushing of differences in thought, values, and art into a sort of baby food which neither nourishes the soul or elevates the mind.
This is because cultural differences are based on geography and exist in nations and regions rather than in the nonsensical "global" community. Indeed, there are cultural differences within most nations of any size that reflect the differences within parts of a nation.