Final answer:
The scenario described by the student illustrates the self-serving bias, where one attributes positive events to their character and negative events to external factors, thus maintaining self-esteem.
Step-by-step explanation:
The student's question describes a scenario where their reasoning for specific behaviors reflects a certain psychological principle. In one instance, where the student justifies letting their kids eat tortillas in a store because they 'can't control their hunger,' and in another, where they praise themselves as a good neighbor for bringing in a neighbor's garbage can without acknowledging the possible influence of guilt or reciprocation, we can identify a cognitive bias. This is specifically called the self-serving bias, which is a tendency to attribute positive events to our own character but attribute negative events to external factors. It protects self-esteem and our sense of self-worth. In this instance, the student is attributing the good deed to their own character, but they are attributing a less socially acceptable behavior (letting their kids eat before purchasing) to factors out of their control (the children's inability to control hunger).