. You missed the part where the FBI knowing that the dossier was false still used it in the Fisa court to get a sign off so that they could tap Trump's phones. Because of the falsehood of it, it led to the whole two year Mueller investigation of trump and the false allegations he conspired with the Russians.
It never was a legitimate investigation. It was put out there to help destroy trump. And almost did.
Worse than that it pushed Trump to be harsher on the Russians than he should have been to show that he wasn't involved with them. This could have led to the very invasion of Ukraine as the Russians felt pressured by NATO and the west. Had there been no Russian investigation, we may have been able to make deals with Russia to show that we had no intention to hurt them through ukraine. And the Ukraine War may never had started.
Also, these attempts to constantly beat up on the Russians push them to become allies of another of our adversaries China when it would have been so much better have we become an ally of Russia against China. The whole Mueller and dossier and all that negative stuff against Trump is going to be shown in history to be a major failing of America.