To “kill,” in the parlance of stand-up comedy, is to fully win over an audience. And while a burly comic is one of the central characters staggering his way through Joe Thirstino’s toxic satire Bringer of Doom, the specter of killing, in the traditional sense of the term, is the larger presence on stage. There are no guns going off, but there are plenty of triggers. Attempted murder, attempted suicide, alcoholism and depression are the stars of this production, with cameo appearances by vengeance and indifference, not to mention an offstage death caused by a wayward sea mammal.