Hope and optimism were always going to be conspicuously absent from the Oakland Athletics’ season opener on Thursday. If those sentiments — which, save for the Haas era, have been fleeting at best for much of the organization’s Bay Area history — hadn’t fully evaporated during the callous dismantling of any talent on the team’s roster, or when the Nevada state legislature approved public funding for the backroom land deal to build a baseball stadium last June, they were certainly gone by November, when MLB owners gave owner John Fisher unanimous approval to move the team to Las Vegas.