To answer your question directly, those terms are no longer condemned because the language has evolved. Retard is used as an insult, but also holds a strong definition in today’s English to refer to the disabled. Moron, idiot, imbecile etc are also used as insults, but do not hold a strong connection to their historical use.
Yonden Lhatoo is the chief news editor at the Post. This article appeared in the South China Morning Post print edition as: Is Donald Trump an idiot? The answer is truly worrying. Yonden Lhatoo
Joseph Schumpeter: Joseph Alois Schumpeter (1883 - 1950) was an economist and one of the 20th century's greatest intellectuals. He is best known for his 1942 book “Capitalism, Socialism, and
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definition of an idiot