They generally are well-intentioned enemies. It may be certain politicians that must pay attention to the public whim. It may be special interests that contribute money to politicians to legitimately advance private interests. It may be the general public with attitudes based on misinformation. Sunlight means truth.
Truth takes the pressure off politicians.
Truth gives oxygen to the Courts. When it comes to public records, there should be a strong presumption in favor of sunshine. The franchise belongs to us all. We should not have to pay for what we already own when the marginal cost of providing public records is zero, or close to zero. Denial of access makes the Judicial Branch vulnerable to the winds of ignorance and expedience.