Except clearly he didn't know the bomb was still active.
Scott is honestly looking a bit psychopathic here. Deciding whether someone gets to live or die based on his own personal assessment of them. More than a little bit of a God-complex going on there considering he's making decisions on behalf of the entire human race, and he technically just wiped out a new form of life. Does that count as genocide? Seems like it would.
He sorta reminds me of Luther from Umbrella Academy.