What feeds the media's attention is that at the same time these groups attach themselves to Trump, Trump does not condemn them *UNTIL* prompted.
Whereas he will take the initiative to launch a condemnatory tweet-storm at anything the finds offensive, from a stage actor offering advice to Pence... to condemning a Fox News anchor for being too harsh against him in a primary debate.
Which shows that he knows how important it is to get ahead of an issue. He *CHOOSES* not to do so in these cases.