The members of the other races that were located very close to each other decided to band together. No matter what, they had to resist the humans. After all, if they did not come together, it was definitely impossible for them to be able to resist the humans individually.
It might be true that they viewed themselves as superior to the humans, but when it came to the power levels, even if they thought the humans were inferior to them, the power level that the humans possessed was incredible.
So at this moment, they had no choice but to collaborate with each other to eliminate the humans first. At this moment, the members of the other races all over the world came into an agreement, and that was to eliminate the humans.
They had already realized that the danger that was posed by the humans was something that they could not handle if they were given a chance to mature. And for that reason, it was better to eliminate them right away.