Objection: The Chernobyl containment building generally speaking does its job. /pol/, on the other hand, leaks like an incontinent old man in a retirement home. "Containment" only works if you have jannies that actually sweep it up. 4chan, much like Voat, suffers a problem of people spamming up boards and threads with unrelated crap that is ostensibly supposed to be kept to other boards/threads (like /pol/). The reputation they have is a consequence of that unmanageability (just like Voat ultimately suffered from when they embraced Reddit's cast-offs and suddenly had people talking about "shitskins" and "day of the rope" everywhere).
You want to me share all the IP addresses I've got banned on for posting stuff on /g/, /sp/, and /int/? There's definitely some level of containment going on. Be it pornography, politics, or gore.