They can also use do-gooder, bleeding heart, man, woman, foreigner, gay, dog, cow, suit, Jew, Christian, Muslim...

Any word can be used as a weapon, if someone is that way inclined. Just think back to your schooldays, if you still can. Every time a useful word is abandoned because it is used as a weapon, that is a forced retreat and a small victory for bigotry. In any war there is likely to be a time when retreat is appropriate, and there are words that I am all in favour of pensioning off (such as "moron") - but this kind of thing should be recognised as a retreat, and we should try to protect the language from this kind of erosion.