I'll explain.
Countless parties try to influence American elections, including hundreds of corporate lobbies and nearly every developed country in the world. The role of a dozen or so Russian propaganda agents in the grand scheme of things was likely negligible. None of us can likely name even one manipulated or pro-Trump narrative these 13 indicted Russians were promoting on social media or pushing to Wikileaks. James Comey's comments about investigating Hillary's emails, which nearly every American heard about for months, must have had far greater reach and impact than anything Russia did or aspired to do.
As for having "dirt" on Hillary Clinton, that doesn't mean anything. No one needs to go to Russia to get dirt on Hillary Clinton. That sounds like a joke. Literally thousands of people have dirt on Hillary Clinton, including James Comey, Huma Abedin, the NYPD, the State Dept., half the CIA (whom both Clintons worked for), and half the state of Arkansas. The only question is whether anyone had the courage or political will to do anything about volumes of dirt on the Clintons. So far, the answer remains, no, not really.
The entire Russia-Trump collusion narrative appears to have been contrived by political opponents of Trump, starting with Marco Rubio's campaign, then handed off to the DNC/Clinton campaign after Trump won the Republican nomination, and then handed off to the FBI, right before Trump was elected. A single dossier was initially developed for all three. It's just a question of who was paying the retainer to Fusion GPS. Mueller and the special counsel's office were later brought in to give legitimacy to it, but it's becoming pretty clear from Mueller's testimony today that he isn't very familiar with the content of the report itself. He's more of a figurehead.
If Democrats were hoping to gain momentum to impeach the president based on a mandate from Mueller, today's hearings were a step backward. There's almost no way Pelosi and Schumer will push for impeachment after today's hearings.