Once you find yourself in an argument, your job is now to make your point clearly, and then leave. You are allowed two passes:

1. State your case
2. Clarify any misunderstandings

Once you have stated your case, there’s no point re-stating it. Going over the same ground repeatedly will damage your case: nobody likes reading the same interminable debate over and over again. Similarly, if people read what you have to say, understand it, but continue to disagree anyway, there’s nothing more you can do unless you suddenly come up with a totally new argument. The only productive thing you can add is if people clearly don’t understand what you’re saying, and you need to clarify.