Why didn't bud use the shotgun to take revenge on amoses?

Bud didn't use the shotgun to take revenge on Amos because he ultimately recognized that resorting to violence would not solve his problems or bring him peace. Instead, he sought a more constructive path by focusing on his own growth and future, rather than getting caught up in a cycle of revenge. Bud's decision reflects his desire to break free from the cycle of anger and hurt that had affected his life.