Most used tactic nowadays to avoid the Truth-asking for proof! It is sinister because it appears like the questioner wants to know what is going on,but more often than not he wants to cover it up- by asking for more evidence.So the chemical companies use this,as the tobacco companies did before them,to avoid dealing with the toxicity of their products,O.J.’s lawyers-Cochrane et al- used it to get him off the hook,politicians use this to approve environmentally destructive projects and now the Russians are using it to deny their impact in the American elections.Science and logic,initially developed to uncover reality is now being used to cover it up.May God help us all!