User:Sans Skelington/Blog:Why did the humans even start a war with monsters?

So these are some theory about why the humans and monsters started a war. I will warn you that there are spoilers, so think of blue stop signs when you read this (unless you have finished Undertale).

The first theory is that the war started after Asriel died. When the humans killed Asriel, the monsters would've declared war on humanity. Only one problem: The intro happens many years before Chara fell, so the theory is automatically debunked.

Another theory could be that, knowing that monsters have magic, humans grew scared of the monsters. They wanted to wipe out the monsters so they could be safe. They did not wipe out anyone, and knowing that the monsters wouldn't quit, they automatically claimed victory. As a compromise, the humans found a new home for the monsters, which was the underground.

My last theory is something very... normal? The humans and monsters started a war to see who the dominant species were. The winner stayed on the surface, while the losers must live in the underground forever. It's kinda like when you were a kid and you had to play things like "Rock, Paper, Scissors" to prove you were better. Of course, the humans, being the dominant race, won the war. The monsters were forced to live in the underground, and you know the rest.

So that gives us three theories: And with one already being debunked, that leaves us with one question:What do you guys think? Which of the two theories do you like the best? Please comment what you think is the best of the two.
 * Asriel's death caused the war (DEBUNKED)
 * The humans were too scared of the monsters, which made them want to wipe them out
 * The humans and monsters wanted to see who was better, thus starting a war