You can say that after that tower many things happened. Those normal people who previously did not know anything about the supernatural also begin to suspect all of this and this already makes many of those people very panicked. The Fighter association in this situation already knows that it was time for them to reveal everything about the supernatural to these normal people. Actually the fighter association wanted to make sure that those normal people did not panic just because of that Tower because they needed to know that earth has powerful people and they will protect them.