While it is definitely too late, and may also be too little, there should be no doubt about the correctness of President Obama’s decision to retaliate against Russia for hacking American computers and trying to influence the 2016 presidential election.

It would have been irresponsible for him to leave office next month and allow President Vladimir Putin to think that he could with impunity try to undermine American democracy. That would have been a particularly dangerous legacy given President-elect Donald Trump’s alarming affinity for Mr. Putin and stubborn refusal to accept the conclusion of American intelligence agencies that Russia’s cyberattacks were aimed at helping him and hurting Hillary Clinton. The president-elect told reporters dismissively before Mr. Obama’s decision was announced that Americans should “get on with our lives” and forget about the hacking scandal. So much for that wishful thought.

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