Reading
This is hard to talk about, because we live in a debased period.
Government’s job, in a democracy, should be to increase the welfare of the people and represent their will.
Because people elect the government, they need to know what the government is doing and has done in order to choose who to elect.
This is fundamental.
When people do not know what the government is doing, they cannot make good decisions.
Further, elected representatives (in principle, not in current practice) are the employees of the population. As employers, the population has a right to know what the representatives are doing. (Or if you prefer another metaphor, perhaps better, they are trustees.) They don’t have the right to know everything, but anything related to the job, including corruption and double dealing, they do.