What does the Nunes memo tell us about the FBI?

What does the Nunes memo tell us about the Trump - Russia collusion investigation at the FBI? In short, that "senior FBI officials used a fake dossier paid for by the Democrats to get a court order for electronic surveillance of the Trump campaign."

Did the de-classification of the memo by President Trump put intelligence asset lives at risk? That is a question that should have been asked back at the end September of 2016, when the agency hired by the Hillary campaign to produce the dossier briefed journalists from the New York Times, Washington Post, Yahoo News, the New Yorker and CNN.
If the Mueller investigation is honest, it will find that Democrats colluded with Russia to undermine the 2016 Presidential election, not Trump, nor his campaign.