Luke knew that things weren't that simple.
He had deliberately simplified the matter.
But over 1,000 lives had been lost and there was a public outcry. Despite the wisdom that came with age, Damon would occasionally think that he might be partly to blame.
Why didn't Luke feel this way? Because he had the system.
After stopping the test subjects, the system had given him 70,000 experience and credit points.
This included shared points from his 3-star teammates, Selina, Mindy, Alice, and the little turtles. All up, they had probably saved 5,000 lives to get so many experience and credit points.
In other words, if his team hadn't been deployed that night, thousands more people would have died in New York.
Between watching thousands of people die without doing anything, or working hard to reduce the number of deaths to just over 1,000, the choice was very simple.