I did not contest the facts. But not using the word retard won't help any way. They face prejudice and discrimination because of their condition, not of the way said condition is called. And if we change the word with other - the other word will still be used as an insult. Because the condition itself is highly undesirable. No one wants to have it.
But simply not wanting to be inflicted with a condition is no excuse to dehumanize people who are. Perhaps part of the problem is simply people mocking eachother for being different, but another part of the problem is the cultural normalcy of abuse promulgated by linking diagnostic terms with definitions of global inferiority. Language is the very matrix from which thought arises, so real-world usage of words can alter people's perceptions.
