Mother Jones writes, This story originally appeared in The Guardian. Tony Hayward, BP's former boss, defended his role in the Deepwater Horizon disaster on Wednesday as lawyers blamed his cost cuts for the deadly oil rig explosion. In video testimony shown to the New Orleans court, Hayward defended the massive cost savings made under his tenure. "When you don't have accountability no one is accountable for anything," he said, under often combative questioning from Robert Cunningham. Hayward was asked about a Guardian article from 2007 which reported on his cost-cutting plans, outlined in a speech to staff in…