The Trump-Russia business is finally coming into clearer, more rational focus. Former Obama CIA chief John Brennan, in testimony this week, offered no evidence of Trump campaign cooperation with Russian intelligence. Instead he spoke of CIA fears that Russia would try to recruit/blackmail/trick Trump colleagues into being witting or unwitting agents of influence.

This is a realistic fear of any incoming administration. It’s especially realistic in the case of an “outsider” campaign full of naive, inexperienced and unvetted...