To piggyback on what’s been said by others here:
Bryan isn’t calling all Trump supporters black-hearted. He’s calling his minions, the ones who blindly follow every word he says and find no reason to question anything he does, the ones with the black hearts.
I’d like to think one thing that both sides of the political spectrum can agree with is that blind adherence to a leader’s words is distinctly un-American, whatever positions that leader holds. The best part about being American is the ability to question, to criticize, to even protest in the streets about things you think are unjust and wrong.
So Matt, if that last paragraph describes you, congrats. Yours is not one of the black hearts.