Generally equity owners (not be confused with directors, executives, employees, officers) are not held liable for the actions of the company or its agents.  I mean should the shareholders of GM (who already lost the capital they invested) be considered "scammers" because the company was so poorly run it was run into the ground.  By that logic any shareholder of any Pirate bond should also get a scammer tag.

I think it sets a bad precedent and basically makes the tag useless.  Now if you had active role in the day to day management that might be different but even then I don't think anyone has ever gotten a scammer tag without intent of malfeasance (i.e. just being foolish or naive isn't grounds for the tag).