At school he had done things which had formerly seemed to him very horrid and made him feel disgusted with himself when he did them; but when later on he saw that such actions were done by people of good position and that they did not regard them as wrong, he was able not exactly to regard them as right, but to forget about them entirely or not be at all troubled at remembering them.
Credible reports came through that syria had used chemical weapons. Whether it's true actually is still open to question, but it's very probably true. At that point, what was at stake was what is called credibility. So if you read the political actors, political leadership, foreign policy commentary, they constantly point out accurately that us credibility was at stake, and we have to maintain us credibility. So therefore something had to be done to show you can't violate our orders.