I'm not grinding any axe. mseebach said that he didn't see how property rights were a form of coercion. You have explained precisely why they are. You are agreeing with me against him. I am not right in a 'strict sense', but in an absolutely correct sense. What could be a better example of coercion than enforcing a law?
"Coerce" is defined in the OED as "persuade (an unwilling person) to do something by using force or threats", so I don't think gravity really falls under that definition, except perhaps metaphorically.
