If the oil companies were acting in the best interests of the shareholders, they would be all-in on renewables. But US oil companies act in the interest of corporate officers, who are all close to retirement.
For me its more like old 'dinosaur' cooperate mentality slows down r&d on alternatives, maybe its more of a fear taking a major step, while other startups with main focus on green energy taking the field and attention. Yet still countries like Norway recognized this years ago and started investing on green.