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It's necessary to have in a racially divided country
Because we should care why people are offended by certain terms.
Caring too much makes people even more sensitive.
There's nothing inherently wrong about being sensitive to the feelings of others.
The racial division in the country is hyperbolized by many who claim the answer is political correctness.
Conversation is becoming a minefield to the uninitiated in PC terminology.
The solution to this is as easy as asking the person they're worried about offending so it's only a minefield if one charges in assuming they understand everyone involved
People no longer know how to talk to each other
No one is arguing that it's not politically correct to ask questions before a discussion to get everyone on the same page so that's primarily due to people not wanting to learn or incorrectly thinking it's rude to do so