If ever there was a time to keep an open mind about the Killers, it is when Brandon Flowers sashays on stage to headline Saturday night in a head-to-toe sparkling gold lamé suit, to a background of dazzling pyrotechnics. It is an immediate reminder that the Killers are a band whose powerful, emphatic stadium rock is beaten only by their total lack of irony. And yet for all their overindulgence, these four boys from Las Vegas draw the biggest crowd of the festival so far and they are here to give the people what they want.