By this time, it seems that Donald Trump has a corrupting effect on just about everybody he comes into contact with. Take, for instance, John Kelly, who rose through the ranks of the US Marine Corps, then was nominated Secretary of Homeland Security before being appointed White House Chief of Staff. If Kelly had refused to serve under the Trump administration, he probably would have been remembered as an honorable and good man, a dedicated public servant. Well, that's all gone to shit, like anything that falls into Donald Trump's clutches.
Kelly has revealed his rather lackluster racism (heh, lazy Hispanics are going to steal your jobs, paradoxically) and now he's on record as having defended a serial wife-beater. Put simply, this man with a remarkable career has turned out to be a shitbag. The real question about the Trump taint is whether Trump surrounds himself with deplorable people, or whether being around Trump actually makes people more bigoted... it's probably a mixture of the two- Trump chooses people with unsavory characteristics as his minions, and the normalization of vileness makes them even more unsavory.
I really can't muster any sympathy for Kelly. I could be intoning 'how the mighty have fallen', but the guy chose to throw in his lot with the most contemptible politician in US history, so his sink into a moral morass was entirely predictable.