You have to say that after knowing all the truth about the world tower all the fighters present there got very shocked. Who could have thought that the world tower would have this kind of motive? Also if they really wanted to stop those portals appearing on Earth then they need to reach floor number 100 and it will take them a very long time to reach that place.
So until then if they are unable to keep up with those Monsters and powerful Monsters come out of the portals then it will be over for earth and earth will be consumed by the world tower. Just thinking about that makes everyone feel nervous and worried.
"Don't worry everyone and don't get nervous after hearing all of this. Right now we need to make sure that we get powerful enough to fight those Monsters and protect our Earth. If we get nervous and scared of the monster then how will those normal people trust us and how will we be able to keep protecting the earth?