I would prefer that the litmus test be respect, which is something that can be encourage, but not legislated.  Of course, people have the right to encourage as loudly as they want, in a manner of their choosing, but the challenge is to do it in a way that people who don't yet agree with you might actually listen.  Otherwise, it is hard to see how the effort can possibly be a good use of anyone's time, other than as a form of venting.