I don't really understand what the purpose of following someone is
Or are you suggesting that white supremacists should not be shunned as a matter of course in normal interaction/conversation?
We're not the ones telling them that Twitter is the real world and not just another internet forum, they're the ones telling us that, they're the ones who hold value in that service because it serves to elevate them, not us.
If a journalist isn't following an individual because they're worried the follower count gives that individual value then I'd say that's a much bigger concern that the journalist holds so much value in follower count on an internet forum. Probably time for them to put the phone down and talk to some real people outside their apartment.
As far as I am aware, it is easy to read anyone's public statements on Twitter without following them and private messages are obviously inherently private. It seems fairly reasonable for journalists to conduct their work in that public forum without without tacitly endorsing white supremacy.
With that said, I am not really sure what your point is. Could you please clarify?