The work of the middleman, such as an insurance broker, is to inspect and recover.
If you have a restaurant and get lousy fish from the boat, you don't get to serve it and proclaim garbage in garbage out. No, your job is to inspect what you get, and if necessary, change it.
If the school board gives the teacher lousy instructions, the teacher can easily put up his hands and say, "I'm just doing my job." The great teacher doesn't do that, of course. He provides a buffer between the administrators and the his real customers, the students.
There will always be garbage in. It's up to the middleman as to whether or not there will be garbage out.