why do people learn and know the truth and still go back to what they know is wr

Sometimes the things we discuss among ourselves, we wish we had no knowledge of , and when someone attempts to infuse their ideas , weather right or wrong, we also don't want to hear what they are saying, we offten take what we hear as foolish rambling, and carring no value, and couldn't help you where you are anyway so we return to what we were doing before knowing it's wrong