Not all data brokers are sketchy, some are very good. Data brokers help assess who is creditworthy and lowers rates for more trustworthy people, and allow the creation of more specialty lending products.
cough un-ecrypted experian backups getting stolen from a UPS truck at gun-point and nothing else stolen cough
Also you can't delete your own credit history data unless it's proved inaccurate. Though you can't delete freeze it.