By abusing the system. And wasting a GM's time.
He contrived a situation that would not normally have happened in the game in order to try and make a point. Blizzard responded with a point of their own: Abuse the system and see where that gets you. Seems perfectly fair to me.
Let the system run its course. Don't be an ass and try and break it. And if you do, don't be surprised when you end suffering penalties. As I said some time ago, a system like this needs a few days/weeks at least to stabilise and get to the point where it is working properly. Right now there is just way too much knee-jerk type reaction happening. Give it time then judge.
Lastly, we have no idea how big this problem actually is. 2 cases out of 5 million players is nothing. But with social media it's very easy to make the problem seem a lot bigger than it is. Blizzard will pretty quickly have a good idea of how many false accusations they are getting and will be in an infinitely better position to assess how well this system is working than some guy on MMO-C focussing on a single case study.