Why would Donald Trump want to waste needless controversy by squandering his capital on prosecuting Hillary Clinton? Voters have already decided that she is not fit to be president. The WSJ’s Review and Outlook describes it this way:

Prosecuting vanquished political opponents is the habit in Third World nations. Healthy democracies prefer their verdicts at the ballot box.

Prosecution would also stir needless controversy that would waste Mr. Trump’s political capital. President Obama made the mistake of blessing then Attorney General Eric Holder ’s decision in 2009 to have a special prosecutor investigate CIA officials over post-9/11 interrogations. This made Mr. Obama look vindictive and ideologically driven, and it was among the decisions that set the tone for the hyperpartisan Obama Presidency.

As a candidate, Mr. Trump’s claim to “lock her up” was probably a good campaign strategy. Mr. Trump’s claim to be “President to all Americans” is probably a better bet, especially since Mrs. Clinton has received democracy’s verdict.

Trump walks back pledge to pursue Clinton probe