Everybody says stupid things. In the context of the conversation, not only in that programme but the wider one in American society over the treatment of black people, Lemon is right. 400 years starting with slavery, rights and resources denied, judicial murder, etc etc, there is no reason to think anything else; institutionalised and national racism, perpetrated by all and silently or openly practised.
Trump has shown little empathy for the people he is supposed to be President over, seeks to win another election at any cost and is holding a rally, indoors, in Florida soon; Dr Saab should put the hurricane storm shutters up!
If Lemon is dumb, then Trump is certainly dumber.