In any case you can't dismiss a lawsuit "because no one has presented any evidence". That is part of a lawsuit itself. Perhaps the evidence will be determined to be insufficient but that will be determined within the proceeding itself.

Now if you want to say that the claims presented in this particular motion is unconvincing, that would make logical sense. But any rationale for dismissing the motion has to be based on what is in the motion, not on what is floating around in social media.

No, six attempted to do so (since the suit was never permitted to be filed, no one actually joined it.)

18 states (including the six that shortly after that filed to join the suit as party intervenors) filed a request to file a pro-plaintiff amicus brief, which is different than joining the suit.