Why does food safety go down when Republicans are in power?

From Paul Krugman's article via jurassicpork at Welcome to Pottersville:

The Washington Post, reviewing F.D.A. documents, found that last month the agency detained shipments from China that included dried apples treated with carcinogenic chemicals and seafood “coated with putrefying bacteria.” You can be sure that a lot of similarly unsafe and disgusting food ends up in American stomachs.

Those who blame corporations also have a point. In 2005, the F.D.A. suspected that peanut butter produced by ConAgra, which sells the product under multiple brand names, might be contaminated with salmonella. According to The New York Times, “when agency inspectors went to the plant that made the peanut butter, the company acknowledged it had destroyed some product but declined to say why,” and refused to let the inspectors examine its records without a written authorization.

According to the company, the agency never followed through. This brings us to our third villain, the Bush administration.

Without question, America’s food safety system has degenerated over the past six years. We don’t know how many times concerns raised by F.D.A. employees were ignored or soft-pedaled by their superiors. What we do know is that since 2001 the F.D.A. has introduced no significant new food safety regulations except those mandated by Congress.

This isn’t simply a matter of caving in to industry pressure. The Bush administration won’t issue food safety regulations even when the private sector wants them. The president of the United Fresh Produce Association says that the industry’s problems “can’t be solved without strong mandatory federal regulations”: without such regulations, scrupulous growers and processors risk being undercut by competitors more willing to cut corners on food safety. Yet the administration refuses to do more than issue nonbinding guidelines.

Why would the administration refuse to regulate an industry that actually wants to be regulated? Officials may fear that they would create a precedent for public-interest regulation of other industries. But they are also influenced by an ideology that says business should never be regulated, no matter what.