His entire Twitter account had been taken over by the white supremacist, and Trump didn't care. What was there was as bad as the WS robo-calls for Trump.
They were his army. Their CPAC was there for Trump. I'd like to know how much money he accepted from them myself (His web site is still begging for donations).
Trump didn't want to speak out against them or he'd lose most of his Cyber power. He needed them for his campaign, which is why he hesitated for days before breaking down and caving to the pressure.
I'm sure he was just hoping no one noticed his KKK supporters - but they DID notice.