No one has done more to revive the reputation of Bush-era antiterror policies than the Obama Administration. In its latest policy reversal, yesterday Mr. Obama said the U.S. would resume the military tribunals for Guantanamo terrorists that he unilaterally suspended two years ago, and he may even begin referring new charges to military commissions within days or weeks.

The political left is enraged by what it claims is a betrayal, but we're glad to see Mr. Obama bowing to security reality and erring on the side of keeping...