A big part of the problem is that people have a natural tendency to over-estimate their own importance. Nobody takes a job he believes is a waste of time, and people self-select into professions they happen to think make a big difference in society. So TSA security screeners believe they're making air travel safer, even when the evidence says they're not. Patent attorneys believe they're promoting innovation, even in industries where the evidence says otherwise. And adoption officials naturally believe that they play a vital role in ensuring kids get placed in loving homes.