Now not only is the attitude different, but the outcome of those two scenarios will be very different too. In the first, the belief that nothing can be done or attempted results in nothing being attempted. So nothing gets done. This confirms the feelings of hopelessness. The tasks don't go away but grow, the person feels increasingly de-moralised, the problems increasingly big.
Social contact is reduced and they feel even more isolated and hopeless.
In the second scenario, having made a start on some things, the person begins to feel a bit more on top of them. This feels encouraging. The sense of uselessness and hopelessness begin to recede. The social contact is affirming and supportive. At the end of the day, the sense of achievement brings some contentment, some hope.