That's why the Henry inquiry's actions are so disturbing.
Reporters who suspect their communications, interactions and movements may be monitored or scrutinised may limit their activities, stifling the flow of information about what is going on in the corridors of power.
This is a democracy, run by the people, for the people, and our window on that mechanism is the Press Gallery.
I'm not saying inquiries shouldn't have wide-ranging powers to investigate rule-breaking and indiscretion. But threatening to undermine a whole system of political reporting by targeting a journalist in that investigation seems ludicrous.
John Key's office said: "The Prime Minister has previously said he, like most New Zealanders, values the role of the fourth estate around Parliament and he does not think it's appropriate to start looking at their activities."
Someone should have passed that on to David Henry.