I don't think you understand that we're discussing massive amounts of...not just circumstantial evidence. There's way, WAY too much concrete information out there to simply be speculation. For instance, NSA Chief admitted to his workforce that they have evidence Trump colluded with the Russians.
Trump reportedly asked DNI Dan Coats and NSA Chief Mike Rogers to deny that Trump had any ties to Russia during the campaign. Both told Trump to pound sand.
In Mike Rogers address to his staff, he reportedly admitted that President Trump asked him to discredit the FBI and James Comey, which the admiral flatly refused to do. As Rogers explained, he informed the commander in chief, “I know you won’t like it, but I have to tell what I have seen”—a probable reference to specific intelligence establishing collusion between the Kremlin and Team Trump.
Rogers then added that such SIGINT exists, and it is damning. He stated, “There is no question that we [meaning NSA] have evidence of election involvement and questionable contacts with the Russians.” Although Rogers did not cite the specific intelligence he was referring to, agency officials with direct knowledge have informed me that DIRNSA was obviously referring to a series of SIGINT reports from 2016 based on intercepts of communications between known Russian intelligence officials and key members of Trump’s campaign, in which they discussed methods of damaging Hillary Clinton.
This doesn't add up.
First, all the congressional intelligence committee members who reviewed the NSA evidence have publicly said there is no evidence of collusion. Some have added "yet".
Second, Clapper has said he has seen no evidence of collusion.
Third, I have doubts that a pro like Rogers would voluntarily speak of highly classified matters, and matters subject to current criminal and congressional investigations, in a manner where leaks are guaranteed.
I have no doubt that Trump requested these people to confirm lack of evidence or affirmatively state there is no evidence of collusion. This is old news, Comey already said Trump made the same request of him, and Comey responded by saying he didn't speak publicly about evidence or lack thereof.