I agree that a president speaking to goals like that would be incredible. But he didn't have almost half the country supporting complete fantastical claims and a decent fraction trying to overturn elections.

But look what he did against racism vs Johnson (not that much compared to J.), and they both still pushed the Vietnam war. Kennedy had to work around the edges on entrenched racism to maintain his Democratic majority with southern votes. At least the parties are more honest about their proclivities today.