1. A particular group becomes a cancer of the chan, like furries
2. You create a board for cancer, like furries, and get them to have fun there
3. You run the board and protect them so that they move there, custom tripcodes are a great bait to get people to move there. All of them would want a limited time colored tripcode with a cap icon.
4. After a few days you shut that board down and permanently range ban all IPs that have ever posted there in one click (along with entire ISPs, countries, and regions of countries that posted relatively much for a good measure if zealous)
5. You enjoy much less cancer, they move somewhere else

If there is a new influx of cancer wait until memory is blurry enough for them to fall again for it
Good classic bait