Trump's rhetoric is essentially saying it's okay to be hateful, to be prejudiced, and to hurt those who disagree with you. That is not the kind of thing we need when we're already politically polarized as hell. He's using that polarization to his advantage and appealing to the worst in people. That's not good.
From my perspective, the dogwhistle racism of the right was just as hurtful to me as Trump's open racism, with the added detriment of the right being able to deny their racism in a way that many people took as credible.
Trump is forcing people to confront the fact that, actually, the United States is still pretty fuckin' racist, and at the same time, it's driving people away from the GOP and ripping the party apart.
From my view as a black person, I don't see a difference between Trump, Cruz, Rubio, or Kasich when it comes to racism other than that Trump is open about his racist rhetoric, which has detrimental consequences to the racist party that he's a spokesperson for.
I agree that Trump is a dangerous demagogue. My thing is -
so is everyone else running for president on the GOP side. In that case, I'll "root" for the guy who brings that racism to light and allows the opposition party to take greater control of Congress and the courts in the process.