Bad faith over Korea
Read that again. The nuclear test is the culmination of what? Of the escalation of totalitarian North Korea's militaristic culture, war-like posturing and long-held nuclear ambitions? No, of American foreign policy of course!
(It's not just the SWP. Here's someone else who thinks the same thing: Bill Weinberg says "Bush's intransigence essentially prompted North Korea to cross the nuclear threshold".)