"It's actually good optics that it exploded, because it shows they aren't changing their schedules for the sake of optics. Political pressure to make the schedule fit the public's feelings was a major contributor to the Challenger disaster. So, having a tank blow up the day before a manned launch shows that SpaceX has overcome the challenges of the past."

(See? That spin makes the turbopump look like a stator. If I have a point it's that talking about optics is pointless, because you can make the optics anything you want by casting the right light.)