Self control is effortful, and can be exhausting (Ego depletion and similar effects). So is active decision making, awareness at times etc.
In my experience, I found out that ignoring this cost is many times better.
The idea is that strategically, having the cost in mind makes you to reduce your self control. Vastly beyond what would have been rational.
I think the very attention paid to the self control costs:
1) discourages using self control.
2) makes it even harder.
3) eventually making self control even more costly.
An additional point is that "doing the right thing" might not always neccesiate using effortful control. Yet thinking about *might* (I am hypothesizing) force one into effotful control mode
