I don't think there's necessarily a 'point' to it. The portal simply interprets a certain feeling of displacement, more present in some cases than others, and tries to... fix it. It's arguable whether it does this on its own, or if it has some form of conscience, but it might also be some part of its programming. I use the word 'programming' loosely, here, since I'm sure it's not quite like a computer like the ones we're used to.