Godlike Monsters

It occurred to me while I was admiring the artwork of fictional monstrous creatures that whenever we depict something of unfathomable size and origin, they're always killing us. Us being humans. The monsters are always the bad guys running around eating and killing people, terrorizing the earth. But what if humans were the bad guys and the creatures are really just trying to bring the peace back. I mean we are the ones destroying the planet. These creatures could just be doing they're job of protecting Earth. After all, although we may be the most intelligent creatures, we're also by far the dumbest and cruelest. So why couldn't it be possible that perhaps the other creature is in fact smarter then us and is exterminating the pest?