Monsters have existed as long as mankind has existed. They were our explanation for things we couldn't understand, things we feared. Some we came to understand later, and now they're as mundane as any other animal or natural phenomenon; but many continue to elude us. Some will never be solved, because we don't want them to be. Monsters represent the unknown, the misunderstood, the danger that refuses, or longs, to be tamed.
Monsters have become somewhat of a queer allegory in recent years. They're popular with queer people, artists especially, because they are relatable. They're outcast, feared, hunted. They're judged for what they are rather than who they are. And whether they're portrayed as angry, vengeful creatures, cornered beasts desperate to defend themselves, or remarkably human things eager to receive as much love as they can and to give it in return, they are the perfect conduit to express the feelings that living that experience can produce. Sometimes we believe that if everyone tells us we're a monster, we must be one. Sometimes being a monster feels safer than being what you are.
But also, I just think they're fuckin' cool.