I think he did need a fed. Watching children burned alive at Waco (he was there), after which the seiging feds proudly posed for photos on their charred ruble, really got the ball rolling on his motivation. I'm not saying the feds told him to do it, but Ruby Ridge, Waco, and feds like Lon Horiuchi getting off scott free after sniping an innocent woman holding a child really radicalized him.