After endless hype, special counsel Robert Mueller may be about to submit his report. It is impossible to know what his conclusions will be. But after so much speculation, one outcome seems likely: Mueller will disappoint just about everyone — especially President Trump’s critics. And it won’t be his fault. This is due in part to Trump’s successful disinformation crusade, which has worked to raise a nearly impossible and definitely illogical bar for Mueller to clear: proving “collusion” and charging a grand criminal conspiracy involving the Trump campaign and the Russian government. But it is also due to Trump’s critics,...