Why does the United States constitution grant the president the power to grant pardons and reprieves? I'd argue that it's for cases exactly like this one. Where someone indeed broke the law, but did the right thing in doing so. We want people to do what is right, not shake our heads tragically and say that the law is the law, and must be followed blindly even if it means punishing a hero for his heroic deeds.

I'd further say that it's the responsibility of the president to use his or her constitutionally granted powers for this purpose, and say that a president that refuses to use the powers of the presidency for the purpose they were intended for is a simply bad at the job of being president.