Genuine question - where is the concrete evidence of harm from the interference in the 2016 elections? We hear a lot about how Cambridge Analytica destroyed th

Genuine question - where is the concrete evidence of harm from the interference in the 2016 elections? We hear a lot about how Cambridge Analytica destroyed the political process, or Russia... But what are the facts in evidence for harm? Put another way: how can we determine actual harm caused, and be sure that it isn't blown out of proportion? (IE Cambridge Analytica playing up their capabilities to get new customers)