Galaxies Pointing Where?

A multitude of galaxies have been found to be pointing in the same direction. The scientific paper and a blog commentary about it says that about 200,000 galaxies are aligned in the same direction. Kudos to Mr Longo for finding this pattern of galactic proportions.
But wait(!), considering the fact that the estimated total number of galaxies in our known universe is around 500 Billion, does 200,000 matter that much? Is this a galactic pattern worth pondering? Someone asked what is it that these polarized galaxies are pointing at. (I imagined iron-fillings being aligned and stiffened into spikes by a magnet).
Then I kinda thought in the other direction - what caused them to point the other way?
The imagery that comes to my mind is the mysterious Tunguska explosion in Siberia. All the trees fell down aligned as if finely-combed radiating outwards from the center of the explosion.
Could the galactic alignment be the result of a great "Cosmic Tunguska explosion"? Or is there some kind of colossal "magnetic" field aligning the galaxies like iron-fillings?