For each person's coin I hold if that person goes "off the rails" then would the value of any of their coins that I hold depreciate (possibly to 0)? If yes, th

For each person's coin I hold if that person goes "off the rails" then would the value of any of their coins that I hold depreciate (possibly to 0)? If yes, then how do you protect yourself from folks like Ken Lay, Jeff Skilling, Bernie Madoff, Mel Gibson, Rob Ford, OJ Simpson... and so forth?