Humans love to see the bad guy lose. Larry Ellison has built a business out of lock-in and lawsuits against his own customers. People hate to see that kind of antisocial behaviour rewarded.
No, them fighting on the side of what's good for the industry is what makes them the good guys in this case, not the fact that they're fighting Oracle. If the positions were switched, I would be biting my tongue and rooting for Oracle.