While that's theoretically possible, that's not my perception of how posts are shared here based on my very short time here. Mostly the things I see circledotted are witty responses or posts that are complimentary to the Hubski system or its users.
For instance, a satire of the ban function with a discussion of the mute function from a positive perspective has 25 shares. A discussion of the mute function by someone who disagrees with the mute function has 2 shares. That's the discussion of the same topic, but one from a positive angle and another from the negative. Many of the same arguments were made in both posts. The post reflecting the best light on the site gets the most shares.
It's just human nature to want to share things that people agree with and puts them in the best light.