I know this will come as a shock, but this is easy. When vacancies occur, IGs are nominated by the President and confirmed by the Senate, and so they pick proven reliable, incompetent lazy do-nothings for the job because no one wants someone who will stir up trouble. Why go to the fuss and bother of hard work, stirring up trouble getting to the bottom of fraud, inefficiency and corruption, when you can just go through the motions, take long lunches, travel as much as you want, and get praise heaped upon you for your diligence in discovering that there really is not much to see, anywhere.
It's all just a day's work in the swamp.
“When vacancies occur, IGs are nominated by the President and confirmed by the Senate, and so they pick proven reliable, incompetent lazy do-nothings for the job...”
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No, they are not stupid and lazy. Horowitz and others are carefully chosen soldiers who will defend the fort. They are proficient and clever at obfuscating, concealing and whitewashing the dirt. The Swamp is too smart to put lazy fools in such trusted positions.