Not sure what this has to do with video games, but PC Gamer posted it, so that's good enough for me.
The problem with the alien debate is that people will say, "The universe is so big, there has to be life out there!" as if that is an argument for aliens visiting our planet.
Here's the reality. If there were 100 billion advanced civilizations in the universe, we'd almost certainly never meet any of them, ever. That's how big the universe is. The odds that one of them found us, managed to get here, and decided to play cat and mouse with us is so astronomically low that it isn't worth consideration. We should spend our time and money on other things, no matter how exciting the possibility is.