"Not a single shred of evidence". I agree, evidence would be most welcome and working without it is fraught with difficulties. But there is a recognised lower standard that we can and so work with when we have to, namely balance of probabilities, which in its turn is related to consistancy. You can read each of the claims in the dossier and ask whether it is consist or inconsistant with his behaviour and approach for which there is evidence, such as tweets, speeches, business dealings and so forth.