Why? Because someone is interpreting a red star as a star of David? I've seen stars like that in all kinds of advertising. I really doubt there was any anti-anything implied except anti-Hillary. In my humble opinion this is much PC ado about nothing.
Yes... fired! Because choosing some other shape (a circle, an oval...) would have delivered Trump's enemies no ammunition.
Caesar's wife must be above suspicion.
Regards,
Horse crap.