By affirming an antisemitic trope, Elon Musk sinks to a dangerous new low | Margaret Sullivan

Elon Musk's endorsement of a blatantly antisemitic screed is shocking but not surprising, says Margaret Sullivan .

Musk has shown his true colors many times before, she says.

She says the billionaire entrepreneur is reckless and reckless.

Sullivan: Musk's impulsiveness and willful, willful, often hateful, misunderstanding of history would be troubling at any time.