Lawsuit was dismissed on legal grounds, not because of lack of evidence or lack of factual merits.
After all, a motion for summary judgment contemplates that all alleged facts in the civil complaint are true. Procedurally, a motion for summary judgment asserts that accepting the allegations as true, the lawsuit cannot proceed as a matter of law.
The judge agreed in this case that the Russian Federation is immune because the Foreign Sovereign Immunity Act requires that all wrongdoing alleged in the lawsuit occur on US soil. The judge also agreed that the First Amendment protects the Trump Campaign and Wikileaks from this lawsuit.
Your post is reflective of the dangers of being superficially informed by social media. Do not feel bad. The leader of the free world also obtains information in the same superficial manner ... and then makes decisions based upon limited and often flawed information.
Link: https://www.scribd.com/document/420269577/DNC-lawsuit-ORDER-Granting-Motion-to-Dismiss-073019