I think this has been a rude awakening for Dershowitz, who is an old-line liberal, to see how deranged the Left has become against Trump. I had the same feeling as you watching the exchange.
I think this has been a rude awakening for Dershowitz
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I suspect that Dershowitz is deeply disturbed about the radical shift in his party, and is genuinely afraid of these people. He has talked openly about getting major blowback from many of his former friends and associates on the Left.
The fountain of visceral hatred that spews from them, and their growing fondness for ignoring political and legal restraints, has him worried about the future of the Republic.
I don’t think he’s a big Trump fan, but he doesn’t want to see our political differences become criminalized, as he puts it. He knows what this can lead to.