Why could kino kill the doctor more easy than talk to him?

Kino might find it easier to kill the doctor than to talk to him because of the intense emotions and desperation he feels regarding his family's situation. The doctor represents the oppressive forces that have wronged Kino and his people, and violence can seem like a more immediate, decisive solution to his suffering. Additionally, the fear of being dismissed or ridiculed may make a conversation with the doctor feel futile, pushing Kino towards a more primal response. Ultimately, the weight of his circumstances may drive him to act on instinct rather than engage in dialogue.