Theodore Kupfer, writing at National Review, has the most sensible reaction I've seen so far to the mass mosque shooting in New Zealand. He seems to understand the world of the online troll and sh**poster, the dark web corridors of 4chan and 8chan, better than those of us who operate entirely outside those fever swamps.
He makes the point that the accused shooter apparently schemed at considerable length, and with some subtlety, to structure his online presence to amplify the goals he pursued in his attack. If Kupfer is correct, the shooter was trying to do much more than merely oppose Muslim immigration, and in places far beyond New Zealand - think Europe and North America as well. It appears to have been an effort some years in the making.