Let’s not split hairs about the manner in which some folks leave their jobs. “Walking out” can imply leaving without warning, or might better represent the worker’s state of mind when they make the decision to give notice.
The underlying problem is that wages are so low in some places that it’s not possible to survive without:
- multiple incomes in the household
- multiple jobs
- going into debt
- living in a dangerous place
Etc.
These conditions leave the person without much choice but to leave.
Anecdotally, I remember multiple instances of coworkers walking out in the middle of a shift when I worked as a cook in a chain restaurant due to the combination of high stress (including abuse from customers and management) and low wages.
It's related to strong senses of personal responsibility and pride in reliability and dependability, in my experience.