The cop is in a position of public trust, and at least in theory is accountable to the public if they abuse that ability. Most people are actively aware that the government has their information, because they submit it themselves when they file taxes, apply for their license, etc. Even if you don't trust the police at all, their stated purpose for having and using this information is logical.
A private company is accountable to nobody, trusted by nobody, and likely accessing "public" information that was publicized by an entity other than the individual. They are collecting the information purely to make a profit, not to (again in theory) increase public safety. Their entire purpose is to abuse the information for purposes it was not intended for.
A private company is accountable to nobody, trusted by nobody, and likely accessing "public" information that was publicized by an entity other than the individual. They are collecting the information purely to make a profit, not to (again in theory) increase public safety. Their entire purpose is to abuse the information for purposes it was not intended for.