Ego depletion

Why people (sociopaths and non), despite their best intentions are unable to always do the right thing? From Wikipedia (with accompanying sites to relevant scientific research):

Ego depletion refers to the idea that self-control or willpower draw upon a limited pool of mental resources that can be used up. When the energy for mental activity is low, self-control is typically impaired, which would be considered a state of ego depletion. In particular, experiencing a state of ego depletion impairs the ability to control oneself later on. A depleting task requiring self-control can have a hindering effect on a subsequent self-control task, even if the tasks are seemingly unrelated. Self-control plays a valuable role in the functioning of the self on both individualistic and interpersonal levels. Ego depletion is therefore a critical topic in experimental psychology, specifically social psychology, because it is a mechanism that contributes to the understanding of the processes of human self-control.
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Conservation hypothesis
The conservation hypothesis is a partial explanation of ego depletion. It suggests that there are two sorts of depletion:

1. When one is completely depleted and unable to self-control.
2. When one is not fully depleted, but partly. Still, one reduces his self-control efforts to avoid complete exhaustion.

According to this view, when people feel depleted, there might still exist a reserve store of energy to be used in extreme, high priority situations that could be encountered in the future. This can be adaptive to the extent that expending any more resources at a given time might render an individual fully depleted of their resources in an unexpected situation requiring self-regulation or other self-monitoring behaviours. The existence of a spare reservoir of mental energy ultimately explains why various motivators can buffer the effects of mild or moderate ego depletion. In a state of low resources, an individual lacks motivation to exert any more energy, but if motivation is presented, there are still extra resources that can be used up. Thus, ego depletion could be conceptualized as a psychological constraint necessary to safeguard precious resources that might be needed in emergency situations in the future. Under mild depletion, people still have a small amount of energy left in their "tank", which they do not have access to under normal circumstances.

Is this why all of my worst examples of losing self-control have happened while traveling and being thrown together in ungodly situations with total strangers?