On cognitive dissonance

When someone tries to use a strategy which is dictated by their ideology, and that strategy doesn't seem to work, then they are caught in something of a cognitive bind. If they acknowledge the failure of the strategy, then they would be forced to question their ideology. If questioning the ideology is unthinkable, then the only possible conclusion is that the strategy failed because it wasn't executed sufficiently well. They respond by turning up the power, rather than by considering alternatives. (This is sometimes referred to as "escalation of failure".) - Steven Den Beste