Didn't know it was possible not to know that.
For the fiftieth-but-not-last time, the Steele dossier was not the entire justification for the finding of probable cause to begin an investigation. It was one of many - we don't know what else there was, but we know some.
And multiple DOJ lawyers and federal judges agreed to this, being very well aware of the gravity of what they were doing.
Again, no one who understands the DOJ or IC doubts their integrity, professionalism and judgment. Only political hacks and Trump fellators and zygote obsessive-compulsives do.