COPENHAGEN, DENMARK — It seems to me that the BlackLivesMatter movement is anti-cop in the same way a “clean the river” campaign is anti-river. The activists behind a “clean the river” campaign don’t hate rivers, or think rivers are evil. Rather, they want to remove the toxins and wastes within the river that pose a threat to their community. They want to see the river transformed into a source of comfort and serenity, instead of something to fear and avoid. If a maniac with a bulldozer began dumping sand in the river, yelling “I hate rivers! Destroy all rivers!” we could not reasonably consider him an ally or disciple of the “clean the river” campaign.