Brandon really sounds like someone's parent, doesn't he, what with his rampant generalisations. Punk, thrash, speed, black and death metal were around well before Nirvana's emergence and none of the aforementioned genres were particularly happy-clappy.
"Flowers says that he thinks his band is now making American music "a lot more playful and brighter". A bit arrogant, really, I mean you're only as big as your last album, for all we know, with the fickle tastes in music, the Killers this time next year could turn out to meet the same destiny as the Knack and Men At Work

If I'm not mistaken, weren't the Scissor Sisters supposed to herald a new world order in "happy" the other year, where exactly are they now?