https://sys.4channel.org/co/imgboard.php?mode=report&no=107750353pestilen/tv/ermin are /co/'s greatest scourge. No matter the cost, they must be purged.
Report each and every single live action thread on sight.
If they aren't deleted, or if you get wrongfully banned, politely appeal to the mods by using the feedback function and speak to them directly on IRC explaining why the threads should be removed (they lead to gratuitous amounts of off topic shitposting, political bullcrap, psychotically belligerent brand fanaticism & false flagging for the sake of trolling, etc.). Furthermore, you can try to convince them that by consolidating discussion of all live action movies and TV shows to /tv/, their jobs will be made much easier since their attention to shitposting in those threads will be more focused if they're on one board instead of two.