What is the ostrich effect?
This refers to the tendency to figuratively put your head in the sand and avoid information about a project, situation, or work practice you believe may be unpleasant or negative.
Example in the hiring process.
Most companies do not really look into the mishire rate at their company or do not ask candidates for feedback on their process, because they have the feeling that the outcome might be even worse than expected. It keeps them from changing the recruitment process.