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My guess is that the bad guy did not realize that there were people in the house or that he thought it was only servants. (bad intell) Having busted in the door and being confronted by unexpected resistance(the law of unintended consequences?), he did not have a back-up plan(failure to plan for all contingencies). Then, realizing that he was in a fix, he failed to make the right decision about retreat. (committment to project in spite of reverses) Overall bad planning, bad decision making, and a bad result.
Hmmmm, a microcosm of business planning..........