Vandals are trolls, simply said. They generally have no care for how the wiki turns out, and if they do, it is misplaced to the point of incomprehensibility. Maybe they're thinking on a level inconceivable to us humble editors, or maybe they just want to watch the world burn. In either case, they aren't doing us any good now, where it counts. Don't expect to win by presuming they have the same mindset as you. By stooping to their level, you are merely casting oil into the flames. The way to victory lies in the steps I mentioned earlier, and while it may not be a flawless system, most vandals don't care enough to exploit its loopholes.