If you aspire to be a genuinely moral being, there is no way around a guilty conscience. The world is not simple and rarely gives us the simple choices which we emotionally crave. Most of the time, we are offered two bad options, where’re neither option is acceptable, but a decision still must be made.
This is how the world works. To avoid facing this fact, the only two obvious alternatives are building an artificial world where all is simple, and self deception. Most people chose self deception, because they cannot tolerate the idea of being bad people. And in lying, they make much worse evil possible, and usually inevitable. Very few people are capable otherwise of the cruelty which moral certitude makes possible. What can be beyond the pale, when you are “saving the world”?