I'm guessing that you're capable of sensible, fair evaluation of a criminal record, and making an accordingly sensible hiring decision.
The problem is that most others are not. Most companies have a blanket ban on felons, even for things that should not be crimes. Remember that it used to be illegal to possess alcohol, or to marry someone outside your race, for example.
Thus, if you value the information that allows you to filter genuinely dangerous individuals from your life and business, then it seems that it would be in your interest for the system that provides such information be robust against injustice and abuse.
