That being said, some shared vehicles are badly parked. I've taken to stopping and moving them off the footpath, rather than just complaining/taking a photo/riding past. If a wheelchair user can't easily move a share bike out of the way, all the more reason for an able-bodied person who sees it to move it preemptively. Doesn't mean it has to be tipped over angrily either.
@jroper all good viewpoints.
Social norms for new modes will be built gradually, partly by people unconsciously observing thousands of good examples, so I think creating good examples is helpful, in a small way.